Number
8
- Positive
- Even
- Composite
- Perfect cube
- 1 digit
8 is an even 1-digit integer and a composite number. It has 4 divisors and a digital root of 8.
The canonical address for this page is /8.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value8
Digit count1
Digit sum8
Digital root8repeated digit sum
PalindromicYesreads the same backwards
Perfect cubeYes, 2³
Fibonacci numberYes, F(6)
Happy numberNosquared-digit sums reach 1
Harshad numberYesdivisible by its own digit sum
Armstrong numberYesdigits raised to the digit count sum to itself
Factors & divisors
Prime factorisation2^3
Distinct prime factors12
Number of divisors4
Sum of divisors σ(n)15
Aliquot sum7sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)4integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 2, 4, 84 in total
Arithmetic
Representations
Decimal8
Binary10004 bits
Octal10
Hexadecimal8
Base 368
Roman numeralVIII
In wordseight
Ordinaleighth
Scientific notation8 × 10^0
Engineering notation8
Nearest landmarks
Powers & multiples
8 to the power 264
8 to the power 3512
8 to the power 44,096
8 to the power 532,768
First ten multiples8, 16, 24, 32, 40, 48, 56, 64, 72, 80
Powers of twoExactly 2^3
Divisibility tests
Divisible by 2Yes
Divisible by 3No, remainder 2
Divisible by 4Yes
Divisible by 5No, remainder 3
Divisible by 6No, remainder 2
Divisible by 7No, remainder 1
Divisible by 8Yes
Divisible by 9No, remainder 8
Divisible by 10No, remainder 8
Divisible by 11No, remainder 8
Divisible by 12No, remainder 8
Divisible by 100No, remainder 8
Collatz (3n + 1) trajectory
Steps to reach 13the total stopping time
Highest value reached8
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps8 → 4 → 2 → 1
As a percentage & fraction
As a percentage800%
8% as a decimal0.08
8% of 1008
8% of 1,00080
As a fraction of 1008/100
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Derived from 8
Other readings
Also reads as
#000008 (colour)
- #000008
- Blue
- Dark
- Nearest: Black
#000008 is a blue with RGB values 0, 0, 8 and HSL 240°, 100%, 2%. It is a dark colour, so white text on it reaches 20.9:1 contrast (AAA for normal text). The nearest named colour is Black.
Colour values
#000008#000008
HEX#000008
RGBrgb(0, 0, 8)
RGB (0–1)0, 0, 0.0314
RGB percentages0%, 0%, 3.1%
HSLhsl(240, 100%, 1.6%)
HSV / HSBhsv(240, 100%, 3.1%)
CMYK100%, 100%, 0%, 96.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer8
CSS custom property--colour: #000008;
Brightness & contrast
Relative luminance0.00018WCAG 2.x, 0 is black and 1 is white
Perceived brightness2.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 20.93:1
Contrast with white20.93:1WCAG normal text: AAA
Contrast with black1:1WCAG normal text: Fail
Greyscale equivalent#010101
Inverted#FFFFF7
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text20.93:1WCAG large text: AAA
Contrast with black, large text1:1WCAG large text: Fail
Named colours
Hue familyblue
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#080800
Analogous#000408, #040008
Triadic#080000, #000800
Split complementary#080400, #040800
Tetradic#080004, #080800, #000804
Tints, shades & saturation
Channel breakdown
R0
G0
B8
Red0 (0%)
Green0 (0%)
Blue8 (3.1%)
Hue240°
Saturation (HSL)100%
Lightness1.57%
Dominant channelBlue
Hex per channelR 00 · G 00 · B 08
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Harmonies
Similar named colours
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