Number
720,021
- Positive
- Odd
- Composite
- 6 digits
720,021 is an odd 6-digit integer and a composite number. It has 4 divisors and a digital root of 3.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value720,021
Digit count6
Digit sum12
Digital root3repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation3 × 240,007
Distinct prime factors23, 240,007
Number of divisors4
Sum of divisors σ(n)960,032
Aliquot sum240,011sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)480,012integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 3, 240,007, 720,0214 in total
Arithmetic
Representations
Decimal720,021
Binary1010111111001001010120 bits
Octal2576225
HexadecimalAFC95
Base 36FFKL
Roman numeralNot defined above 3,999there is no agreed standard notation
In wordsseven hundred and twenty thousand and twenty-one
Ordinalseven hundred and twenty thousand and twenty-first
Scientific notation7.20021 × 10^5
Engineering notation720.021 × 10^3
Nearest landmarks
Powers & multiples
720,021 to the power 2518,430,240,441
720,021 to the power 3373,280,660,152,569,261
720,021 to the power 4268,769,914,203,713,071,874,481
720,021 to the power 5193,519,982,394,871,689,724,135,684,101
First ten multiples720,021, 1,440,042, 2,160,063, 2,880,084, 3,600,105, 4,320,126, 5,040,147, 5,760,168, 6,480,189, 7,200,210
Powers of twoBetween 2^19 (524,288) and 2^20 (1,048,576)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3Yes
Divisible by 4No, remainder 1
Divisible by 5No, remainder 1
Divisible by 6No, remainder 3
Divisible by 7No, remainder 1
Divisible by 8No, remainder 5
Divisible by 9No, remainder 3
Divisible by 10No, remainder 1
Divisible by 11No, remainder 5
Divisible by 12No, remainder 9
Divisible by 100No, remainder 21
Collatz (3n + 1) trajectory
Steps to reach 166the total stopping time
Highest value reached2,160,0643× the starting value
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps720,021 → 2,160,064 → 1,080,032 → 540,016 → 270,008 → 135,004 → 67,502 → 33,751 → 101,254 → 50,627 → …
Last steps… → 32 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage72,002,100%
720,021% as a decimal7,200.21
720,021% of 100720,021
720,021% of 1,0007,200,210
As a fraction of 100720,021/100
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Derived from 720,021
Also reads as
#720021 (colour)
- #720021
- Red
- Dark
- Nearest: Brown
#720021 is a red with RGB values 114, 0, 33 and HSL 343°, 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 Brown.
Colour values
#720021#720021
HEX#720021
RGBrgb(114, 0, 33)
RGB (0–1)0.4471, 0, 0.1294
RGB percentages44.7%, 0%, 12.9%
HSLhsl(342.6, 100%, 22.4%)
HSV / HSBhsv(342.6, 100%, 44.7%)
CMYK0%, 100%, 71.1%, 55.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer7,471,137
CSS custom property--colour: #720021;
Brightness & contrast
Relative luminance0.03687WCAG 2.x, 0 is black and 1 is white
Perceived brightness63.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 12.09:1
Contrast with white12.09:1WCAG normal text: AAA
Contrast with black1.74:1WCAG normal text: Fail
Greyscale equivalent#1B1B1B
Inverted#8DFFDE
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text12.09:1WCAG large text: AAA
Contrast with black, large text1.74:1WCAG large text: Fail
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#007251
Analogous#72005A, #721800
Triadic#217200, #002172
Split complementary#007218, #005A72
Tetradic#5A7200, #007251, #180072
Tints, shades & saturation
Channel breakdown
R114
G0
B33
Red114 (44.7%)
Green0 (0%)
Blue33 (12.9%)
Hue342.63°
Saturation (HSL)100%
Lightness22.35%
Dominant channelRed
Hex per channelR 72 · G 00 · B 21
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