Number
636
- Positive
- Even
- Composite
- 3 digits
636 is an even 3-digit integer and a composite number. It has 12 divisors and a digital root of 6.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value636
Digit count3
Digit sum15
Digital root6repeated digit sum
PalindromicYesreads the same backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation2^2 × 3 × 53
Distinct prime factors32, 3, 53
Number of divisors12
Sum of divisors σ(n)1,512
Aliquot sum876sum of the proper divisors
ClassificationAbundantthe aliquot sum exceeds the number
Euler's totient φ(n)208integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 2, 3, 4, 6, 12, 53, 106, 159, 212, 318, 63612 in total
Arithmetic
Representations
Decimal636
Binary100111110010 bits
Octal1174
Hexadecimal27C
Base 36HO
Roman numeralDCXXXVI
In wordssix hundred and thirty-six
Ordinalsix hundred and thirty-sixth
Scientific notation6.36 × 10^2
Engineering notation636
Nearest landmarks
Powers & multiples
636 to the power 2404,496
636 to the power 3257,259,456
636 to the power 4163,617,014,016
636 to the power 5104,060,420,914,176
First ten multiples636, 1,272, 1,908, 2,544, 3,180, 3,816, 4,452, 5,088, 5,724, 6,360
Powers of twoBetween 2^9 (512) and 2^10 (1,024)
Divisibility tests
Divisible by 2Yes
Divisible by 3Yes
Divisible by 4Yes
Divisible by 5No, remainder 1
Divisible by 6Yes
Divisible by 7No, remainder 6
Divisible by 8No, remainder 4
Divisible by 9No, remainder 6
Divisible by 10No, remainder 6
Divisible by 11No, remainder 9
Divisible by 12Yes
Divisible by 100No, remainder 36
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 steps636 → 318 → 159 → 478 → 239 → 718 → 359 → 1,078 → 539 → 1,618 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage63,600%
636% as a decimal6.36
636% of 100636
636% of 1,0006,360
As a fraction of 100636/100
Read another way
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Derived from 636
Other readings
Also reads as
#663366 (colour)
- #663366
- Magenta
- Dark
- Nearest: Dark slateblue
#663366 is a magenta with RGB values 102, 51, 102 and HSL 300°, 33%, 30%. It is a dark colour, so white text on it reaches 9.4:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.
Colour values
#663366#663366
HEX#663366
HEX (short)#636
RGBrgb(102, 51, 102)
RGB (0–1)0.4, 0.2, 0.4
RGB percentages40%, 20%, 40%
HSLhsl(300, 33.3%, 30%)
HSV / HSBhsv(300, 50%, 40%)
CMYK0%, 50%, 0%, 60%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,697,830
CSS custom property--colour: #663366;
Brightness & contrast
Relative luminance0.06152WCAG 2.x, 0 is black and 1 is white
Perceived brightness76.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.42:1
Contrast with white9.42:1WCAG normal text: AAA
Contrast with black2.23:1WCAG normal text: Fail
Greyscale equivalent#424242
Inverted#99CC99
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text9.42:1WCAG large text: AAA
Contrast with black, large text2.23:1WCAG large text: Fail
Named colours
Hue familymagenta
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#336633
Analogous#4D3366, #66334D
Triadic#666633, #336666
Split complementary#4D6633, #33664D
Tetradic#664D33, #336633, #334D66
Tints, shades & saturation
Channel breakdown
R102
G51
B102
Red102 (40%)
Green51 (20%)
Blue102 (40%)
Hue300°
Saturation (HSL)33.33%
Lightness30%
Dominant channelRed and Blue
Hex per channelR 66 · G 33 · B 66
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Harmonies
Similar named colours
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