Number
720,400
- Positive
- Even
- Composite
- 6 digits
720,400 is an even 6-digit integer and a composite number. It has 30 divisors and a digital root of 4.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value720,400
Digit count6
Digit sum13
Digital root4repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation2^4 × 5^2 × 1,801
Distinct prime factors32, 5, 1,801
Number of divisors30
Sum of divisors σ(n)1,731,722
Aliquot sum1,011,322sum of the proper divisors
ClassificationAbundantthe aliquot sum exceeds the number
Euler's totient φ(n)288,000integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 1,801, 3,602, 7,204, 9,005, 14,408, 18,010, 28,816, 36,020, 45,025, 72,040, 90,050, 144,080, 180,100, 360,200, 720,40030 in total
Arithmetic
Representations
Decimal720,400
Binary1010111111100001000020 bits
Octal2577020
HexadecimalAFE10
Base 36FFV4
Roman numeralNot defined above 3,999there is no agreed standard notation
In wordsseven hundred and twenty thousand, four hundred
Ordinalseven hundred and twenty thousand, four hundredth
Scientific notation7.204 × 10^5
Engineering notation720.4 × 10^3
Nearest landmarks
Powers & multiples
720,400 to the power 2518,976,160,000
720,400 to the power 3373,870,425,664,000,000
720,400 to the power 4269,336,254,648,345,600,000,000
720,400 to the power 5194,029,837,848,668,170,240,000,000,000
First ten multiples720,400, 1,440,800, 2,161,200, 2,881,600, 3,602,000, 4,322,400, 5,042,800, 5,763,200, 6,483,600, 7,204,000
Powers of twoBetween 2^19 (524,288) and 2^20 (1,048,576)
Divisibility tests
Divisible by 2Yes
Divisible by 3No, remainder 1
Divisible by 4Yes
Divisible by 5Yes
Divisible by 6No, remainder 4
Divisible by 7No, remainder 2
Divisible by 8Yes
Divisible by 9No, remainder 4
Divisible by 10Yes
Divisible by 11No, remainder 10
Divisible by 12No, remainder 4
Divisible by 100Yes
Collatz (3n + 1) trajectory
Steps to reach 1198the total stopping time
Highest value reached2,079,5922× the starting value
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps720,400 → 360,200 → 180,100 → 90,050 → 45,025 → 135,076 → 67,538 → 33,769 → 101,308 → 50,654 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage72,040,000%
720,400% as a decimal7,204
720,400% of 100720,400
720,400% of 1,0007,204,000
As a fraction of 100720,400/100
Read another way
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Derived from 720,400
Also reads as
#720400 (colour)
- #720400
- Red
- Dark
- Nearest: Maroon
#720400 is a red with RGB values 114, 4, 0 and HSL 2°, 100%, 22%. It is a dark colour, so white text on it reaches 12.1:1 contrast (AAA for normal text). The nearest named colour is Maroon.
Colour values
#720400#720400
HEX#720400
RGBrgb(114, 4, 0)
RGB (0–1)0.4471, 0.0157, 0
RGB percentages44.7%, 1.6%, 0%
HSLhsl(2.1, 100%, 22.4%)
HSV / HSBhsv(2.1, 100%, 44.7%)
CMYK0%, 96.5%, 100%, 55.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer7,472,128
CSS custom property--colour: #720400;
Brightness & contrast
Relative luminance0.03664WCAG 2.x, 0 is black and 1 is white
Perceived brightness62.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 12.12:1
Contrast with white12.12:1WCAG normal text: AAA
Contrast with black1.73:1WCAG normal text: Fail
Greyscale equivalent#1B1B1B
Inverted#8DFBFF
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text12.12:1WCAG large text: AAA
Contrast with black, large text1.73:1WCAG large text: Fail
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#006E72
Analogous#720035, #723D00
Triadic#007204, #040072
Split complementary#00723D, #003572
Tetradic#357200, #006E72, #3D0072
Tints, shades & saturation
Channel breakdown
R114
G4
B0
Red114 (44.7%)
Green4 (1.6%)
Blue0 (0%)
Hue2.11°
Saturation (HSL)100%
Lightness22.35%
Dominant channelRed
Hex per channelR 72 · G 04 · B 00
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