Recognised as Number
729,721
- Positive
- Odd
- Composite
- 6 digits
729,721 is an odd 6-digit integer and a composite number. It has 4 divisors and a digital root of 1.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value729,721
Digit count6
Digit sum28
Digit product1,764
Multiplicative persistence5times the digit product can be taken before one digit is left
Digital root1repeated digit sum
PalindromicNoreads differently backwards
Happy numberYessquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation23 × 31,727
Distinct prime factors223, 31,727
Number of divisors4
Sum of divisors σ(n)761,472
Aliquot sum31,751sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)697,972integers below n that share no factor with it
Carmichael function λ(n)348,986the smallest exponent with aˣ ≡ 1 for every unit; smaller than φ(n) = 697,972
Möbius function μ(n)+12 distinct prime factors, an even number of them
SquarefreeYesno repeated prime factor
All divisors1, 23, 31,727, 729,7214 in total
Arithmetic
Representations
Decimal729,721
Binary1011001000100111100120 bits
Octal2621171
HexadecimalB2279
Base 36FN21
Roman numeralNot defined above 3,999there is no agreed standard notation
In wordsseven hundred and twenty-nine thousand, seven hundred and twenty-one
Ordinalseven hundred and twenty-nine thousand, seven hundred and twenty-first
Scientific notation7.29721 × 10^5
Engineering notation729.721 × 10^3
In other bases
Ternary1101001222201base 3; the most digit-efficient integer base after e: 13 digits
Quinary141322341base 5; one hand: 9 digits
Septenary6126316base 7: 7 digits
Nonary1331881base 9; each digit is two ternary digits: 7 digits
Duodecimal2b2361base 12; divides by 2, 3, 4 and 6, which is why eggs and inches come in twelves: 6 digits
Vigesimal4b461base 20; hands and feet, and the Mayan and Yoruba systems: 5 digits
Sexagesimal3:22:42:1base 60; Babylonian, and still how an hour and a circle are divided: 4 digits
Balanced ternary110101T000T01digits −1, 0 and +1 written T, 0 and 1; negation is swapping T and 1, so no sign is needed
Negabinary111110110011110001001base −2; place values alternate 1, −2, 4, −8, so every integer has exactly one form without a sign
Bit-level
00000000000010110010001001111001
Bit length20 bitsto write the magnitude
Set bits10the population count, or Hamming weight
Zero bits10within that length
Bit parityeven10 set bits, so even; not the same as the number itself being odd
Highest set bitbit 19worth 524,288
Lowest set bitbit 00 trailing zeros
Power of twoNo
Bytes30b 22 79
Gray code11101011001101000101n XOR (n >> 1); successive values differ in exactly one bit
At each machine width
32-bit00000000000010110010001001111001
64-bit0000000000000000000000000000000000000000000010110010001001111001
One's complement11111111111101001101110110000110at 32 bits, every bit flipped
Bits reversed10011110010001001101000000000000at 32 bits
Rotated left by 100000000000101100100010011110010at 32 bits, wrapping
Shifted left by 1101100100010011110010= 1,459,442, no wrap
Shifted right by 11011001000100111100= 364,860, discarding the low bit
These bits as a double3.60530077 × 10^-318≈IEEE-754 binary64 reinterpretation of the same 64 bits (subnormal)
Nearest landmarks
Powers & multiples
729,721 to the power 2532,492,737,841
729,721 to the power 3388,571,133,150,072,361
729,721 to the power 4283,548,515,853,403,953,341,281
729,721 to the power 5206,911,306,537,061,786,236,152,912,601
First ten multiples729,721, 1,459,442, 2,189,163, 2,918,884, 3,648,605, 4,378,326, 5,108,047, 5,837,768, 6,567,489, 7,297,210
Powers of twoBetween 2^19 (524,288) and 2^20 (1,048,576)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 1
Divisible by 4No, remainder 1
Divisible by 5No, remainder 1
Divisible by 6No, remainder 1
Divisible by 7No, remainder 6
Divisible by 8No, remainder 1
Divisible by 9No, remainder 1
Divisible by 10No, remainder 1
Divisible by 11No, remainder 3
Divisible by 12No, remainder 1
Divisible by 100No, remainder 21
Collatz (3n + 1) trajectory
Steps to reach 1180the total stopping time
Highest value reached4,156,0005× the starting value
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps729,721 → 2,189,164 → 1,094,582 → 547,291 → 1,641,874 → 820,937 → 2,462,812 → 1,231,406 → 615,703 → 1,847,110 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage72,972,100%
729,721% as a decimal7,297.21
729,721% of 100729,721
729,721% of 1,0007,297,210
As a fraction of 100729,721/100
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Derived from 729,721
Also reads as
#729721 (colour)
- #729721
- Green
- Dark
- Nearest: Olivedrab
#729721 is a green with RGB values 114, 151, 33 and HSL 79°, 64%, 36%. It is a dark colour, so black text on it reaches 6.2:1 contrast (AA for normal text). The nearest named colour is Olivedrab.
Colour values
#729721#729721
HEX#729721
RGBrgb(114, 151, 33)
RGB (0–1)0.4471, 0.5922, 0.1294
RGB percentages44.7%, 59.2%, 12.9%
HSLhsl(78.8, 64.1%, 36.1%)
HSV / HSBhsv(78.8, 78.1%, 59.2%)
CMYK24.5%, 0%, 78.1%, 40.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer7,509,793
CSS custom property--colour: #729721;
Brightness & contrast
Relative luminance0.2582WCAG 2.x, 0 is black and 1 is white
Perceived brightness131.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 6.16:1
Contrast with white3.41:1WCAG normal text: Fail
Contrast with black6.16:1WCAG normal text: AA
Greyscale equivalent#878787
Inverted#8D68DE
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text3.41:1WCAG large text: AA
Contrast with black, large text6.16:1WCAG large text: AAA
Named colours
Hue familygreen
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#462197
Analogous#978121, #379721
Triadic#217297, #972172
Split complementary#213797, #812197
Tetradic#219781, #462197, #972137
Tints, shades & saturation
Channel breakdown
R114
G151
B33
Red114 (44.7%)
Green151 (59.2%)
Blue33 (12.9%)
Hue78.81°
Saturation (HSL)64.13%
Lightness36.08%
Dominant channelGreen
Hex per channelR 72 · G 97 · B 21
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Harmonies
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