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Number

780

Positive
Even
Composite
3 digits

780 is an even 3-digit integer and a composite number. It has 24 divisors and a digital root of 6.

Number properties

ParityEvendivisible by 2

SignPositive

PrimalityComposite

Absolute value780

Digit count3

Digit sum15

Digital root6repeated digit sum

PalindromicNoreads differently backwards

Triangular numberYes, the 39th triangular number

Happy numberNosquared-digit sums reach 1

Harshad numberYesdivisible by its own digit sum

Factors & divisors

Prime factorisation2^2 × 3 × 5 × 13

Distinct prime factors42, 3, 5, 13

Number of divisors24

Sum of divisors σ(n)2,352

Aliquot sum1,572sum of the proper divisors

ClassificationAbundantthe aliquot sum exceeds the number

Euler's totient φ(n)192integers below n that share no factor with it

SquarefreeNohas a repeated prime factor

All divisors1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390, 78024 in total

Arithmetic

Previous number779

Next number781

Double1,560

Half390

Cube474,552,000

Square root27.928480088≈irrational, shown to 9 decimal places

Cube root9.205164083≈

Negation-780

Reciprocal0.0012820513≈

780 factorial8497239289796407209824953394041583203290… (1,919 digits)

Representations

Decimal780

Binary110000110010 bits

Octal1414

Hexadecimal30C

Base 36LO

Roman numeralDCCLXXX

In wordsseven hundred and eighty

Ordinalseven hundred and eightieth

Scientific notation7.8 × 10^2

Engineering notation780

Nearest landmarks

Next prime787+7

Previous prime773−7

Distance to nearest prime7

Nearest square below729

Nearest square above784

Powers & multiples

780 to the power 2608,400

780 to the power 3474,552,000

780 to the power 4370,150,560,000

780 to the power 5288,717,436,800,000

First ten multiples780, 1,560, 2,340, 3,120, 3,900, 4,680, 5,460, 6,240, 7,020, 7,800

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

Divisibility tests

Divisible by 2Yes

Divisible by 3Yes

Divisible by 4Yes

Divisible by 5Yes

Divisible by 6Yes

Divisible by 7No, remainder 3

Divisible by 8No, remainder 4

Divisible by 9No, remainder 6

Divisible by 10Yes

Divisible by 11No, remainder 10

Divisible by 12Yes

Divisible by 100No, remainder 80

Collatz (3n + 1) trajectory

Steps to reach 1121the total stopping time

Highest value reached9,23211× the starting value

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

First steps780 → 390 → 195 → 586 → 293 → 880 → 440 → 220 → 110 → 55 → …

Last steps… → 5 → 16 → 8 → 4 → 2 → 1

As a percentage & fraction

As a percentage78,000%

780% as a decimal7.8

780% of 100780

780% of 1,0007,800

As a fraction of 100780/100

Read another way

As seconds13 minutes

As bytes780 B

As a 24-bit colour#00030C

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Neighbouring numbers

Derived from 780

Nearby primes

Other readings

Also reads as

#778800 (colour)

#778800
Yellow
Dark
Nearest: Olive

#778800 is a yellow with RGB values 119, 136, 0 and HSL 68°, 100%, 27%. It is a dark colour, so black text on it reaches 5.3:1 contrast (AA for normal text). The nearest named colour is Olive.

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Colour values

#778800#778800

HEX#778800

HEX (short)#780

RGBrgb(119, 136, 0)

RGB (0–1)0.4667, 0.5333, 0

RGB percentages46.7%, 53.3%, 0%

HSLhsl(67.5, 100%, 26.7%)

HSV / HSBhsv(67.5, 100%, 53.3%)

CMYK12.5%, 0%, 100%, 46.7%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer7,833,600

CSS custom property--colour: #778800;

Brightness & contrast

Relative luminance0.2153WCAG 2.x, 0 is black and 1 is white

Perceived brightness122.8 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.31:1

Contrast with white3.96:1WCAG normal text: Fail

Contrast with black5.31:1WCAG normal text: AA

Greyscale equivalent#7B7B7B

Inverted#8877FF

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#928000no red cones; affects about 1% of men; ΔE 16.8 from the original

Deuteranopia#908017no green cones; the most common form, about 1% of men; ΔE 16.8 from the original

Tritanopia#7F8073no blue cones; rare, and affects men and women equally; ΔE 53.9 from the original

Distinguishable without hueYesnever rely on hue alone to carry meaning

Contrast with white, large text3.96:1WCAG large text: AA

Contrast with black, large text5.31:1WCAG large text: AAA

Named colours

Olive · ΔE 8.5 Olivedrab · ΔE 10.6 Dark olivegreen · ΔE 29.3 Dark khaki · ΔE 29.7 Yellow green · ΔE 29.8 Forest green · ΔE 31.1

Nearest named CSS colourOlive (#808000)ΔE 8.53, clearly different but related

Hue familyyellow

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#110088

Analogous#885500, #338800

Triadic#007788, #880077

Split complementary#003388, #550088

Tetradic#008855, #110088, #880033

Tints, shades & saturation

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

Lighter +40%#EAFF55

Lighter +30%#E3FF22

Lighter +20%#D0EE00

Lighter +10%#A4BB00

Darker −10%#4A5500

Darker −20%#1E2200

Darker −30%#000000

Darker −40%#000000

More saturated +25%#778800

Less saturated −25%#6A7711

Channel breakdown

R119

G136

B0

Red119 (46.7%)

Green136 (53.3%)

Blue0 (0%)

Hue67.5°

Saturation (HSL)100%

Lightness26.67%

Dominant channelGreen

Hex per channelR 77 · G 88 · B 00

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Harmonies

Lighter and darker

Similar named colours

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