Number
64
- Positive
- Even
- Composite
- Perfect square
- Perfect cube
- 2 digits
64 is an even 2-digit integer and a composite number. It has 7 divisors and a digital root of 1.
The canonical address for this page is /64.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value64
Digit count2
Digit sum10
Digital root1repeated digit sum
PalindromicNoreads differently backwards
Perfect squareYes, 8²
Perfect cubeYes, 4³
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation2^6
Distinct prime factors12
Number of divisors7
Sum of divisors σ(n)127
Aliquot sum63sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)32integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 2, 4, 8, 16, 32, 647 in total
Arithmetic
Representations
Decimal64
Binary10000007 bits
Octal100
Hexadecimal40
Base 361S
Roman numeralLXIV
In wordssixty-four
Ordinalsixty-fourth
Scientific notation6.4 × 10^1
Engineering notation64
Nearest landmarks
Powers & multiples
64 to the power 24,096
64 to the power 3262,144
64 to the power 416,777,216
64 to the power 51,073,741,824
First ten multiples64, 128, 192, 256, 320, 384, 448, 512, 576, 640
Powers of twoExactly 2^6
Divisibility tests
Divisible by 2Yes
Divisible by 3No, remainder 1
Divisible by 4Yes
Divisible by 5No, remainder 4
Divisible by 6No, remainder 4
Divisible by 7No, remainder 1
Divisible by 8Yes
Divisible by 9No, remainder 1
Divisible by 10No, remainder 4
Divisible by 11No, remainder 9
Divisible by 12No, remainder 4
Divisible by 100No, remainder 64
Collatz (3n + 1) trajectory
Steps to reach 16the total stopping time
Highest value reached64
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps64 → 32 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage6,400%
64% as a decimal0.64
64% of 10064
64% of 1,000640
As a fraction of 10064/100
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Derived from 64
Other readings
Also reads as
#000064 (colour)
- #000064
- Blue
- Dark
- Nearest: Midnight blue
#000064 is a blue with RGB values 0, 0, 100 and HSL 240°, 100%, 20%. It is a dark colour, so white text on it reaches 17.7:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.
Colour values
#000064#000064
HEX#000064
RGBrgb(0, 0, 100)
RGB (0–1)0, 0, 0.3922
RGB percentages0%, 0%, 39.2%
HSLhsl(240, 100%, 19.6%)
HSV / HSBhsv(240, 100%, 39.2%)
CMYK100%, 100%, 0%, 60.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer100
CSS custom property--colour: #000064;
Brightness & contrast
Relative luminance0.0092WCAG 2.x, 0 is black and 1 is white
Perceived brightness33.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 17.74:1
Contrast with white17.74:1WCAG normal text: AAA
Contrast with black1.18:1WCAG normal text: Fail
Greyscale equivalent#070707
Inverted#FFFF9B
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text17.74:1WCAG large text: AAA
Contrast with black, large text1.18:1WCAG large text: Fail
Named colours
Hue familyblue
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#646400
Analogous#003264, #320064
Triadic#640000, #006400
Split complementary#643200, #326400
Tetradic#640032, #646400, #006432
Tints, shades & saturation
Channel breakdown
R0
G0
B100
Red0 (0%)
Green0 (0%)
Blue100 (39.2%)
Hue240°
Saturation (HSL)100%
Lightness19.61%
Dominant channelBlue
Hex per channelR 00 · G 00 · B 64
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