Number
328
- Positive
- Even
- Composite
- 3 digits
328 is an even 3-digit integer and a composite number. It has 8 divisors and a digital root of 4.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value328
Digit count3
Digit sum13
Digital root4repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation2^3 × 41
Distinct prime factors22, 41
Number of divisors8
Sum of divisors σ(n)630
Aliquot sum302sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)160integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 2, 4, 8, 41, 82, 164, 3288 in total
Arithmetic
Representations
Decimal328
Binary1010010009 bits
Octal510
Hexadecimal148
Base 3694
Roman numeralCCCXXVIII
In wordsthree hundred and twenty-eight
Ordinalthree hundred and twenty-eighth
Scientific notation3.28 × 10^2
Engineering notation328
Nearest landmarks
Powers & multiples
328 to the power 2107,584
328 to the power 335,287,552
328 to the power 411,574,317,056
328 to the power 53,796,375,994,368
First ten multiples328, 656, 984, 1,312, 1,640, 1,968, 2,296, 2,624, 2,952, 3,280
Powers of twoBetween 2^8 (256) and 2^9 (512)
Divisibility tests
Divisible by 2Yes
Divisible by 3No, remainder 1
Divisible by 4Yes
Divisible by 5No, remainder 3
Divisible by 6No, remainder 4
Divisible by 7No, remainder 6
Divisible by 8Yes
Divisible by 9No, remainder 4
Divisible by 10No, remainder 8
Divisible by 11No, remainder 9
Divisible by 12No, remainder 4
Divisible by 100No, remainder 28
Collatz (3n + 1) trajectory
Steps to reach 1112the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps328 → 164 → 82 → 41 → 124 → 62 → 31 → 94 → 47 → 142 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage32,800%
328% as a decimal3.28
328% of 100328
328% of 1,0003,280
As a fraction of 100328/100
Read another way
Keep nerding
Every link below is a page Nerdulator can generate from what it already knows about this value.
Derived from 328
Other readings
Also reads as
#332288 (colour)
- #332288
- Blue
- Dark
- Nearest: Midnight blue
#332288 is a blue with RGB values 51, 34, 136 and HSL 250°, 60%, 33%. It is a dark colour, so white text on it reaches 12.2:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.
Colour values
#332288#332288
HEX#332288
HEX (short)#328
RGBrgb(51, 34, 136)
RGB (0–1)0.2, 0.1333, 0.5333
RGB percentages20%, 13.3%, 53.3%
HSLhsl(250, 60%, 33.3%)
HSV / HSBhsv(250, 75%, 53.3%)
CMYK62.5%, 75%, 0%, 46.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,351,176
CSS custom property--colour: #332288;
Brightness & contrast
Relative luminance0.03625WCAG 2.x, 0 is black and 1 is white
Perceived brightness59.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 12.17:1
Contrast with white12.17:1WCAG normal text: AAA
Contrast with black1.73:1WCAG normal text: Fail
Greyscale equivalent#2D2D2D
Inverted#CCDD77
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text12.17:1WCAG large text: AAA
Contrast with black, large text1.73:1WCAG large text: Fail
Named colours
Hue familyblue
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#778822
Analogous#224488, #662288
Triadic#883322, #228833
Split complementary#886622, #448822
Tetradic#882244, #778822, #228866
Tints, shades & saturation
Channel breakdown
R51
G34
B136
Red51 (20%)
Green34 (13.3%)
Blue136 (53.3%)
Hue250°
Saturation (HSL)60%
Lightness33.33%
Dominant channelBlue
Hex per channelR 33 · G 22 · B 88
Keep nerding
Every link below is a page Nerdulator can generate from what it already knows about this value.
Harmonies
Similar named colours
Nerdulate something else
Nothing in mind? Surprise me · today’s page