Number

690

Positive
Even
Composite
3 digits

690 is an even 3-digit integer and a composite number. It has 16 divisors and a digital root of 6.

Number properties

ParityEvendivisible by 2

SignPositive

PrimalityComposite

Absolute value690

Digit count3

Digit sum15

Digital root6repeated digit sum

PalindromicNoreads differently backwards

Happy numberNosquared-digit sums reach 1

Harshad numberYesdivisible by its own digit sum

Factors & divisors

Prime factorisation2 × 3 × 5 × 23

Distinct prime factors42, 3, 5, 23

Number of divisors16

Sum of divisors σ(n)1,728

Aliquot sum1,038sum of the proper divisors

ClassificationAbundantthe aliquot sum exceeds the number

Euler's totient φ(n)176integers below n that share no factor with it

SquarefreeYesno repeated prime factor

All divisors1, 2, 3, 5, 6, 10, 15, 23, 30, 46, 69, 115, 138, 230, 345, 69016 in total

Arithmetic

Previous number689

Next number691

Double1,380

Half345

Square476,100

Cube328,509,000

Square root26.267851073≈irrational, shown to 9 decimal places

Cube root8.836555922≈

Negation-690

Reciprocal0.0014492754≈

690 factorial9146333355710483883867221524642754975008… (1,661 digits)

Representations

Decimal690

Binary101011001010 bits

Octal1262

Hexadecimal2B2

Base 36J6

Roman numeralDCXC

In wordssix hundred and ninety

Ordinalsix hundred and ninetieth

Scientific notation6.9 × 10^2

Engineering notation690

Nearest landmarks

Next prime691+1

Previous prime683−7

Distance to nearest prime1

Nearest square below676

Nearest square above729

Powers & multiples

690 to the power 2476,100

690 to the power 3328,509,000

690 to the power 4226,671,210,000

690 to the power 5156,403,134,900,000

First ten multiples690, 1,380, 2,070, 2,760, 3,450, 4,140, 4,830, 5,520, 6,210, 6,900

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

Divisibility tests

Divisible by 2Yes

Divisible by 3Yes

Divisible by 4No, remainder 2

Divisible by 5Yes

Divisible by 6Yes

Divisible by 7No, remainder 4

Divisible by 8No, remainder 2

Divisible by 9No, remainder 6

Divisible by 10Yes

Divisible by 11No, remainder 8

Divisible by 12No, remainder 6

Divisible by 100No, remainder 90

Collatz (3n + 1) trajectory

Steps to reach 1126the total stopping time

Highest value reached9,23213× the starting value

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

First steps690 → 345 → 1,036 → 518 → 259 → 778 → 389 → 1,168 → 584 → 292 → …

Last steps… → 5 → 16 → 8 → 4 → 2 → 1

As a percentage & fraction

As a percentage69,000%

690% as a decimal6.9

690% of 100690

690% of 1,0006,900

As a fraction of 100690/100

Read another way

As seconds11 minutes and 30 seconds

As bytes690 B

As a 24-bit colour#0002B2

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Neighbouring numbers

Derived from 690

Nearby primes

#669900 (colour)

#669900
Green
Dark
Nearest: Olivedrab

#669900 is a green with RGB values 102, 153, 0 and HSL 80°, 100%, 30%. It is a dark colour, so black text on it reaches 6.1:1 contrast (AA for normal text). The nearest named colour is Olivedrab.

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Colour values

#669900#669900

HEX#669900

HEX (short)#690

RGBrgb(102, 153, 0)

RGB (0–1)0.4, 0.6, 0

RGB percentages40%, 60%, 0%

HSLhsl(80, 100%, 30%)

HSV / HSBhsv(80, 100%, 60%)

CMYK33.3%, 0%, 100%, 40%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer6,723,840

CSS custom property--colour: #669900;

Brightness & contrast

Relative luminance0.25607WCAG 2.x, 0 is black and 1 is white

Perceived brightness129.8 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 6.12:1

Contrast with white3.43:1WCAG normal text: Fail

Contrast with black6.12:1WCAG normal text: AA

Greyscale equivalent#838383

Inverted#9966FF

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#A18D00no red cones; affects about 1% of men; ΔE 32 from the original

Deuteranopia#9A891Dno green cones; the most common form, about 1% of men; ΔE 31.8 from the original

Tritanopia#699281no blue cones; rare, and affects men and women equally; ΔE 58.8 from the original

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

Contrast with white, large text3.43:1WCAG large text: AA

Contrast with black, large text6.12:1WCAG large text: AAA

Named colours

Olivedrab · ΔE 13.7 Yellow green · ΔE 20 Forest green · ΔE 21.3 Green · ΔE 21.6 Olive · ΔE 24.5 Dark green · ΔE 29.1

Nearest named CSS colourOlivedrab (#6B8E23)ΔE 13.74, a distinctly different colour

Hue familygreen

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#330099

Analogous#998000, #1A9900

Triadic#006699, #990066

Split complementary#001999, #7F0099

Tetradic#009980, #330099, #99001A

Tints, shades & saturation

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

Lighter +40%#CCFF66

Lighter +30%#BBFF33

Lighter +20%#AAFF00

Lighter +10%#88CC00

Darker −10%#446600

Darker −20%#223300

Darker −30%#000000

Darker −40%#000000

More saturated +25%#669900

Less saturated −25%#608613

Channel breakdown

R102

G153

Red102 (40%)

Green153 (60%)

Blue0 (0%)

Hue80°

Saturation (HSL)100%

Lightness30%

Dominant channelGreen

Hex per channelR 66 · G 99 · B 00

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Every link below is a page Nerdulator can generate from what it already knows about this value.

690

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 690

Nearby primes

Other readings

#669900 (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

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