Recognised as Number
722
- Positive
- Even
- Composite
- 3 digits
722 is an even 3-digit integer and a composite number. It has 6 divisors and a digital root of 2.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value722
Digit count3
Digit sum11
Digit product28
Multiplicative persistence3times the digit product can be taken before one digit is left
Digital root2repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation2 × 19^2
Distinct prime factors22, 19
Number of divisors6
Sum of divisors σ(n)1,143
Aliquot sum421sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)342integers below n that share no factor with it
Carmichael function λ(n)342the smallest exponent with aˣ ≡ 1 for every unit coprime to n
Möbius function μ(n)0zero, because a prime divides n twice
SquarefreeNohas a repeated prime factor
All divisors1, 2, 19, 38, 361, 7226 in total
Arithmetic
Representations
Decimal722
Binary101101001010 bits
Octal1322
Hexadecimal2D2
Base 36K2
Roman numeralDCCXXII
In wordsseven hundred and twenty-two
Ordinalseven hundred and twenty-second
Scientific notation7.22 × 10^2
Engineering notation722
In other bases
Ternary222202base 3; the most digit-efficient integer base after e: 6 digits
Quinary10342base 5; one hand: 5 digits
Septenary2051base 7: 4 digits
Nonary882base 9; each digit is two ternary digits: 3 digits
Duodecimal502base 12; divides by 2, 3, 4 and 6, which is why eggs and inches come in twelves: 3 digits
Vigesimal1g2base 20; hands and feet, and the Mayan and Yoruba systems: 3 digits
Sexagesimal12:2base 60; Babylonian, and still how an hour and a circle are divided: 2 digits
Balanced ternary1000T1Tdigits −1, 0 and +1 written T, 0 and 1; negation is swapping T and 1, so no sign is needed
Negabinary11111010110base −2; place values alternate 1, −2, 4, −8, so every integer has exactly one form without a sign
Bit-level
0000001011010010
Bit length10 bitsto write the magnitude
Set bits5the population count, or Hamming weight
Zero bits5within that length
Bit parityodd5 set bits, so odd; not the same as the number itself being even
Highest set bitbit 9worth 512
Lowest set bitbit 11 trailing zero
Power of twoNo
Bytes202 d2
Gray code1110111011n XOR (n >> 1); successive values differ in exactly one bit
At each machine width
16-bit0000001011010010
32-bit00000000000000000000001011010010
64-bit0000000000000000000000000000000000000000000000000000001011010010
One's complement1111110100101101at 16 bits, every bit flipped
Bits reversed0100101101000000at 16 bits
Rotated left by 10000010110100100at 16 bits, wrapping
Shifted left by 110110100100= 1,444, no wrap
Shifted right by 1101101001= 361, discarding the low bit
These bits as a double3.56715396 × 10^-321≈IEEE-754 binary64 reinterpretation of the same 64 bits (subnormal)
Nearest landmarks
Powers & multiples
722 to the power 2521,284
722 to the power 3376,367,048
722 to the power 4271,737,008,656
722 to the power 5196,194,120,249,632
First ten multiples722, 1,444, 2,166, 2,888, 3,610, 4,332, 5,054, 5,776, 6,498, 7,220
Powers of twoBetween 2^9 (512) and 2^10 (1,024)
Divisibility tests
Divisible by 2Yes
Divisible by 3No, remainder 2
Divisible by 4No, remainder 2
Divisible by 5No, remainder 2
Divisible by 6No, remainder 2
Divisible by 7No, remainder 1
Divisible by 8No, remainder 2
Divisible by 9No, remainder 2
Divisible by 10No, remainder 2
Divisible by 11No, remainder 7
Divisible by 12No, remainder 2
Divisible by 100No, remainder 22
Collatz (3n + 1) trajectory
Steps to reach 146the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps722 → 361 → 1,084 → 542 → 271 → 814 → 407 → 1,222 → 611 → 1,834 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage72,200%
722% as a decimal7.22
722% of 100722
722% of 1,0007,220
As a fraction of 100722/100
Read another way
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Derived from 722
Other readings
Also reads as
#772222 (colour)
- #772222
- Red
- Dark
- Nearest: Brown
#772222 is a red with RGB values 119, 34, 34 and HSL 0°, 56%, 30%. It is a dark colour, so white text on it reaches 10.3:1 contrast (AAA for normal text). The nearest named colour is Brown.
Colour values
#772222#772222
HEX#772222
HEX (short)#722
RGBrgb(119, 34, 34)
RGB (0–1)0.4667, 0.1333, 0.1333
RGB percentages46.7%, 13.3%, 13.3%
HSLhsl(0, 55.6%, 30%)
HSV / HSBhsv(0, 71.4%, 46.7%)
CMYK0%, 71.4%, 71.4%, 53.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer7,807,522
CSS custom property--colour: #772222;
Brightness & contrast
Relative luminance0.05181WCAG 2.x, 0 is black and 1 is white
Perceived brightness71 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.31:1
Contrast with white10.31:1WCAG normal text: AAA
Contrast with black2.04:1WCAG normal text: Fail
Greyscale equivalent#343434
Inverted#88DDDD
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.31:1WCAG large text: AAA
Contrast with black, large text2.04:1WCAG large text: Fail
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#227777
Analogous#77224D, #774D22
Triadic#227722, #222277
Split complementary#22774D, #224D77
Tetradic#4D7722, #227777, #4D2277
Tints, shades & saturation
Channel breakdown
R119
G34
B34
Red119 (46.7%)
Green34 (13.3%)
Blue34 (13.3%)
Hue0°
Saturation (HSL)55.56%
Lightness30%
Dominant channelRed
Hex per channelR 77 · G 22 · B 22
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