Number

724

Positive
Even
Composite
3 digits

724 is an even 3-digit integer and a composite number. It has 6 divisors and a digital root of 4.

Number properties

ParityEvendivisible by 2

SignPositive

PrimalityComposite

Absolute value724

Digit count3

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 factorisation2^2 × 181

Distinct prime factors22, 181

Number of divisors6

Sum of divisors σ(n)1,274

Aliquot sum550sum of the proper divisors

ClassificationDeficientthe aliquot sum is less than the number

Euler's totient φ(n)360integers below n that share no factor with it

SquarefreeNohas a repeated prime factor

All divisors1, 2, 4, 181, 362, 7246 in total

Arithmetic

Previous number723

Next number725

Double1,448

Half362

Square524,176

Cube379,503,424

Square root26.907248094≈irrational, shown to 9 decimal places

Cube root8.979376646≈

Negation-724

Reciprocal0.0013812155≈

724 factorial7088041210438967801802350029277141278495… (1,758 digits)

Representations

Decimal724

Binary101101010010 bits

Octal1324

Hexadecimal2D4

Base 36K4

Roman numeralDCCXXIV

In wordsseven hundred and twenty-four

Ordinalseven hundred and twenty-fourth

Scientific notation7.24 × 10^2

Engineering notation724

Nearest landmarks

Next prime727+3

Previous prime719−5

Distance to nearest prime3

Nearest square below676

Nearest square above729

Powers & multiples

724 to the power 2524,176

724 to the power 3379,503,424

724 to the power 4274,760,478,976

724 to the power 5198,926,586,778,624

First ten multiples724, 1,448, 2,172, 2,896, 3,620, 4,344, 5,068, 5,792, 6,516, 7,240

Powers of twoBetween 2^9 (512) and 2^10 (1,024)

Divisibility tests

Divisible by 2Yes

Divisible by 3No, remainder 1

Divisible by 4Yes

Divisible by 5No, remainder 4

Divisible by 6No, remainder 4

Divisible by 7No, remainder 3

Divisible by 8No, remainder 4

Divisible by 9No, remainder 4

Divisible by 10No, remainder 4

Divisible by 11No, remainder 9

Divisible by 12No, remainder 4

Divisible by 100No, remainder 24

Collatz (3n + 1) trajectory

Steps to reach 120the total stopping time

Highest value reached724

Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven

First steps724 → 362 → 181 → 544 → 272 → 136 → 68 → 34 → 17 → 52 → …

Last steps… → 5 → 16 → 8 → 4 → 2 → 1

As a percentage & fraction

As a percentage72,400%

724% as a decimal7.24

724% of 100724

724% of 1,0007,240

As a fraction of 100724/100

Read another way

As seconds12 minutes and 4 seconds

As bytes724 B

As a 24-bit colour#0002D4

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Neighbouring numbers

Derived from 724

Nearby primes

#772244 (colour)

#772244
Red
Dark
Nearest: Pale violetred

#772244 is a red with RGB values 119, 34, 68 and HSL 336°, 56%, 30%. It is a dark colour, so white text on it reaches 10:1 contrast (AAA for normal text). The nearest named colour is Pale violetred.

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Colour values

#772244#772244

HEX#772244

HEX (short)#724

RGBrgb(119, 34, 68)

RGB (0–1)0.4667, 0.1333, 0.2667

RGB percentages46.7%, 13.3%, 26.7%

HSLhsl(336, 55.6%, 30%)

HSV / HSBhsv(336, 71.4%, 46.7%)

CMYK0%, 71.4%, 42.9%, 53.3%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer7,807,556

CSS custom property--colour: #772244;

Brightness & contrast

Relative luminance0.05483WCAG 2.x, 0 is black and 1 is white

Perceived brightness73.8 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 10.02:1

Contrast with white10.02:1WCAG normal text: AAA

Contrast with black2.1:1WCAG normal text: Fail

Greyscale equivalent#373737

Inverted#88DDBB

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#333845no red cones; affects about 1% of men; ΔE 39.7 from the original

Deuteranopia#4A4842no green cones; the most common form, about 1% of men; ΔE 40.5 from the original

Tritanopia#811830no blue cones; rare, and affects men and women equally; ΔE 14.8 from the original

Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning

Contrast with white, large text10.02:1WCAG large text: AAA

Contrast with black, large text2.1:1WCAG large text: Fail

Named colours

Pale violetred · ΔE 33 Brown · ΔE 33.7 Indian red · ΔE 34.2 Medium violet red · ΔE 38.4 Maroon · ΔE 39.3 Sienna · ΔE 40.6

Nearest named CSS colourPale violetred (#DB7093)ΔE 33, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

base +30°+90°+120°+180°+210°+240°+270°+330°

Complementary#227755

Analogous#77226F, #772A22

Triadic#447722, #224477

Split complementary#22772B, #226F77

Tetradic#6F7722, #227755, #2A2277

Tints, shades & saturation

+40%+30%+20%+10%base -10%-20%-30%-40%

Lighter +40%#DD88AA

Lighter +30%#D2608E

Lighter +20%#C63971

Lighter +10%#9F2D5B

Darker −10%#4F172D

Darker −20%#280B17

Darker −30%#000000

Darker −40%#000000

More saturated +25%#8A0F40

Less saturated −25%#643548

Channel breakdown

R119

G34

B68

Red119 (46.7%)

Green34 (13.3%)

Blue68 (26.7%)

Hue336°

Saturation (HSL)55.56%

Lightness30%

Dominant channelRed

Hex per channelR 77 · G 22 · B 44

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724

Number properties

Factors & divisors

Arithmetic

Representations

Nearest landmarks

Powers & multiples

Divisibility tests

Collatz (3n + 1) trajectory

As a percentage & fraction

Read another way

Keep nerding

Neighbouring numbers

Derived from 724

Nearby primes

Other readings

#772244 (colour)

Colour values

Brightness & contrast

Colour vision & accessibility

Named colours

Colour harmonies

Tints, shades & saturation

Channel breakdown

Keep nerding

Harmonies

Lighter and darker

Similar named colours

Nerdulate something else