Number
528
- Positive
- Even
- Composite
- 3 digits
528 is an even 3-digit integer and a composite number. It has 20 divisors and a digital root of 6.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value528
Digit count3
Digit sum15
Digital root6repeated digit sum
PalindromicNoreads differently backwards
Triangular numberYes, the 32nd triangular number
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation2^4 × 3 × 11
Distinct prime factors32, 3, 11
Number of divisors20
Sum of divisors σ(n)1,488
Aliquot sum960sum of the proper divisors
ClassificationAbundantthe aliquot sum exceeds the number
Euler's totient φ(n)160integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 2, 3, 4, 6, 8, 11, 12, 16, 22, 24, 33, 44, 48, 66, 88, 132, 176, 264, 52820 in total
Arithmetic
Representations
Decimal528
Binary100001000010 bits
Octal1020
Hexadecimal210
Base 36EO
Roman numeralDXXVIII
In wordsfive hundred and twenty-eight
Ordinalfive hundred and twenty-eighth
Scientific notation5.28 × 10^2
Engineering notation528
Nearest landmarks
Powers & multiples
528 to the power 2278,784
528 to the power 3147,197,952
528 to the power 477,720,518,656
528 to the power 541,036,433,850,368
First ten multiples528, 1,056, 1,584, 2,112, 2,640, 3,168, 3,696, 4,224, 4,752, 5,280
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 3
Divisible by 6Yes
Divisible by 7No, remainder 3
Divisible by 8Yes
Divisible by 9No, remainder 6
Divisible by 10No, remainder 8
Divisible by 11Yes
Divisible by 12Yes
Divisible by 100No, remainder 28
Collatz (3n + 1) trajectory
Steps to reach 130the total stopping time
Highest value reached528
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps528 → 264 → 132 → 66 → 33 → 100 → 50 → 25 → 76 → 38 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage52,800%
528% as a decimal5.28
528% of 100528
528% of 1,0005,280
As a fraction of 100528/100
Read another way
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Derived from 528
Other readings
Also reads as
#552288 (colour)
- #552288
- Violet
- Dark
- Nearest: Rebecca purple
#552288 is a violet with RGB values 85, 34, 136 and HSL 270°, 60%, 33%. It is a dark colour, so white text on it reaches 10.7:1 contrast (AAA for normal text). The nearest named colour is Rebecca purple.
Colour values
#552288#552288
HEX#552288
HEX (short)#528
RGBrgb(85, 34, 136)
RGB (0–1)0.3333, 0.1333, 0.5333
RGB percentages33.3%, 13.3%, 53.3%
HSLhsl(270, 60%, 33.3%)
HSV / HSBhsv(270, 75%, 53.3%)
CMYK37.5%, 75%, 0%, 46.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,579,400
CSS custom property--colour: #552288;
Brightness & contrast
Relative luminance0.04853WCAG 2.x, 0 is black and 1 is white
Perceived brightness70.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.66:1
Contrast with white10.66:1WCAG normal text: AAA
Contrast with black1.97:1WCAG normal text: Fail
Greyscale equivalent#343434
Inverted#AADD77
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.66:1WCAG large text: AAA
Contrast with black, large text1.97:1WCAG large text: Fail
Named colours
Hue familyviolet
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#558822
Analogous#222288, #882288
Triadic#885522, #228855
Split complementary#888822, #228822
Tetradic#882222, #558822, #228888
Tints, shades & saturation
Channel breakdown
R85
G34
B136
Red85 (33.3%)
Green34 (13.3%)
Blue136 (53.3%)
Hue270°
Saturation (HSL)60%
Lightness33.33%
Dominant channelBlue
Hex per channelR 55 · G 22 · B 88
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Harmonies
Similar named colours
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