Number
585
- Positive
- Odd
- Composite
- 3 digits
585 is an odd 3-digit integer and a composite number. It has 12 divisors and a digital root of 9.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value585
Digit count3
Digit sum18
Digital root9repeated digit sum
PalindromicYesreads the same backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation3^2 × 5 × 13
Distinct prime factors33, 5, 13
Number of divisors12
Sum of divisors σ(n)1,092
Aliquot sum507sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)288integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 3, 5, 9, 13, 15, 39, 45, 65, 117, 195, 58512 in total
Arithmetic
Representations
Decimal585
Binary100100100110 bits
Octal1111
Hexadecimal249
Base 36G9
Roman numeralDLXXXV
In wordsfive hundred and eighty-five
Ordinalfive hundred and eighty-fifth
Scientific notation5.85 × 10^2
Engineering notation585
Nearest landmarks
Powers & multiples
585 to the power 2342,225
585 to the power 3200,201,625
585 to the power 4117,117,950,625
585 to the power 568,514,001,115,625
First ten multiples585, 1,170, 1,755, 2,340, 2,925, 3,510, 4,095, 4,680, 5,265, 5,850
Powers of twoBetween 2^9 (512) and 2^10 (1,024)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3Yes
Divisible by 4No, remainder 1
Divisible by 5Yes
Divisible by 6No, remainder 3
Divisible by 7No, remainder 4
Divisible by 8No, remainder 1
Divisible by 9Yes
Divisible by 10No, remainder 5
Divisible by 11No, remainder 2
Divisible by 12No, remainder 9
Divisible by 100No, remainder 85
Collatz (3n + 1) trajectory
Steps to reach 156the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps585 → 1,756 → 878 → 439 → 1,318 → 659 → 1,978 → 989 → 2,968 → 1,484 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage58,500%
585% as a decimal5.85
585% of 100585
585% of 1,0005,850
As a fraction of 100585/100
Read another way
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Derived from 585
Other readings
Also reads as
#558855 (colour)
- #558855
- Green
- Dark
- Nearest: Sea green
#558855 is a green with RGB values 85, 136, 85 and HSL 120°, 23%, 43%. It is a dark colour, so black text on it reaches 5:1 contrast (AA for normal text). The nearest named colour is Sea green.
Colour values
#558855#558855
HEX#558855
HEX (short)#585
RGBrgb(85, 136, 85)
RGB (0–1)0.3333, 0.5333, 0.3333
RGB percentages33.3%, 53.3%, 33.3%
HSLhsl(120, 23.1%, 43.3%)
HSV / HSBhsv(120, 37.5%, 53.3%)
CMYK37.5%, 0%, 37.5%, 46.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,605,461
CSS custom property--colour: #558855;
Brightness & contrast
Relative luminance0.20195WCAG 2.x, 0 is black and 1 is white
Perceived brightness117.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.04:1
Contrast with white4.17:1WCAG normal text: Fail
Contrast with black5.04:1WCAG normal text: AA
Greyscale equivalent#797979
Inverted#AA77AA
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.17:1WCAG large text: AA
Contrast with black, large text5.04:1WCAG large text: AAA
Named colours
Hue familygreen
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#885588
Analogous#6F8855, #55886F
Triadic#555588, #885555
Split complementary#6F5588, #88556F
Tetradic#556F88, #885588, #886F55
Tints, shades & saturation
Channel breakdown
R85
G136
B85
Red85 (33.3%)
Green136 (53.3%)
Blue85 (33.3%)
Hue120°
Saturation (HSL)23.08%
Lightness43.33%
Dominant channelGreen
Hex per channelR 55 · G 88 · B 55
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Harmonies
Similar named colours
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