Recognised as Number
742,728
- Positive
- Even
- Composite
- 6 digits
742,728 is an even 6-digit integer and a composite number. It has 32 divisors and a digital root of 3.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value742,728
Digit count6
Digit sum30
Digit product6,272
Multiplicative persistence5times the digit product can be taken before one digit is left
Digital root3repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation2^3 × 3 × 7 × 4,421
Distinct prime factors42, 3, 7, 4,421
Number of divisors32
Sum of divisors σ(n)2,122,560
Aliquot sum1,379,832sum of the proper divisors
ClassificationAbundantthe aliquot sum exceeds the number
Euler's totient φ(n)212,160integers below n that share no factor with it
Carmichael function λ(n)13,260the smallest exponent with aˣ ≡ 1 for every unit; smaller than φ(n) = 212,160
Möbius function μ(n)0zero, because a prime divides n twice
SquarefreeNohas a repeated prime factor
All divisors1, 2, 3, 4, 6, 7, 8, 12, 14, 21, 24, 28, 42, 56, 84, 168, 4,421, 8,842, 13,263, 17,684, 26,526, 30,947, 35,368, 53,052, 61,894, 92,841, 106,104, 123,788, 185,682, 247,576, 371,364, 742,72832 in total
Arithmetic
Representations
Decimal742,728
Binary1011010101010100100020 bits
Octal2652510
HexadecimalB5548
Base 36FX3C
Roman numeralNot defined above 3,999there is no agreed standard notation
In wordsseven hundred and forty-two thousand, seven hundred and twenty-eight
Ordinalseven hundred and forty-two thousand, seven hundred and twenty-eighth
Scientific notation7.42728 × 10^5
Engineering notation742.728 × 10^3
In other bases
Ternary1101201211110base 3; the most digit-efficient integer base after e: 13 digits
Quinary142231403base 5; one hand: 9 digits
Septenary6212250base 7: 7 digits
Nonary1351743base 9; each digit is two ternary digits: 7 digits
Duodecimal2b99a0base 12; divides by 2, 3, 4 and 6, which is why eggs and inches come in twelves: 6 digits
Vigesimal4cgg8base 20; hands and feet, and the Mayan and Yoruba systems: 5 digits
Sexagesimal3:26:18:48base 60; Babylonian, and still how an hour and a circle are divided: 4 digits
Balanced ternary111TT1TT11110digits −1, 0 and +1 written T, 0 and 1; negation is swapping T and 1, so no sign is needed
Negabinary111110101010101011000base −2; place values alternate 1, −2, 4, −8, so every integer has exactly one form without a sign
Bit-level
00000000000010110101010101001000
Bit length20 bitsto write the magnitude
Set bits9the population count, or Hamming weight
Zero bits11within that length
Bit parityodd9 set bits, so odd; not the same as the number itself being even
Highest set bitbit 19worth 524,288
Lowest set bitbit 33 trailing zeros
Power of twoNo
Bytes30b 55 48
Gray code11101111111111101100n XOR (n >> 1); successive values differ in exactly one bit
At each machine width
32-bit00000000000010110101010101001000
64-bit0000000000000000000000000000000000000000000010110101010101001000
One's complement11111111111101001010101010110111at 32 bits, every bit flipped
Bits reversed00010010101010101101000000000000at 32 bits
Rotated left by 100000000000101101010101010010000at 32 bits, wrapping
Shifted left by 1101101010101010010000= 1,485,456, no wrap
Shifted right by 11011010101010100100= 371,364, discarding the low bit
These bits as a double3.66956389 × 10^-318≈IEEE-754 binary64 reinterpretation of the same 64 bits (subnormal)
Nearest landmarks
Powers & multiples
742,728 to the power 2551,644,881,984
742,728 to the power 3409,722,099,906,212,352
742,728 to the power 4304,312,075,819,141,287,776,256
742,728 to the power 5226,021,099,448,999,170,387,483,066,368
First ten multiples742,728, 1,485,456, 2,228,184, 2,970,912, 3,713,640, 4,456,368, 5,199,096, 5,941,824, 6,684,552, 7,427,280
Powers of twoBetween 2^19 (524,288) and 2^20 (1,048,576)
Divisibility tests
Divisible by 2Yes
Divisible by 3Yes
Divisible by 4Yes
Divisible by 5No, remainder 3
Divisible by 6Yes
Divisible by 7Yes
Divisible by 8Yes
Divisible by 9No, remainder 3
Divisible by 10No, remainder 8
Divisible by 11No, remainder 8
Divisible by 12Yes
Divisible by 100No, remainder 28
Collatz (3n + 1) trajectory
Steps to reach 1118the total stopping time
Highest value reached18,068,99224× the starting value
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps742,728 → 371,364 → 185,682 → 92,841 → 278,524 → 139,262 → 69,631 → 208,894 → 104,447 → 313,342 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage74,272,800%
742,728% as a decimal7,427.28
742,728% of 100742,728
742,728% of 1,0007,427,280
As a fraction of 100742,728/100
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Derived from 742,728
Also reads as
#742728 (colour)
- #742728
- Red
- Dark
- Nearest: Brown
#742728 is a red with RGB values 116, 39, 40 and HSL 359°, 50%, 30%. It is a dark colour, so white text on it reaches 10.2:1 contrast (AAA for normal text). The nearest named colour is Brown.
Colour values
#742728#742728
HEX#742728
RGBrgb(116, 39, 40)
RGB (0–1)0.4549, 0.1529, 0.1569
RGB percentages45.5%, 15.3%, 15.7%
HSLhsl(359.2, 49.7%, 30.4%)
HSV / HSBhsv(359.2, 66.4%, 45.5%)
CMYK0%, 66.4%, 65.5%, 54.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer7,612,200
CSS custom property--colour: #742728;
Brightness & contrast
Relative luminance0.05317WCAG 2.x, 0 is black and 1 is white
Perceived brightness71.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.18:1
Contrast with white10.18:1WCAG normal text: AAA
Contrast with black2.06:1WCAG normal text: Fail
Greyscale equivalent#373737
Inverted#8BD8D7
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.18:1WCAG large text: AAA
Contrast with black, large text2.06:1WCAG large text: Fail
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#277473
Analogous#74274F, #744C27
Triadic#287427, #272874
Split complementary#27744D, #274F74
Tetradic#4F7427, #277473, #4C2774
Tints, shades & saturation
Channel breakdown
R116
G39
B40
Red116 (45.5%)
Green39 (15.3%)
Blue40 (15.7%)
Hue359.22°
Saturation (HSL)49.68%
Lightness30.39%
Dominant channelRed
Hex per channelR 74 · G 27 · B 28
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