Number
428
- Positive
- Even
- Composite
- 3 digits
428 is an even 3-digit integer and a composite number. It has 6 divisors and a digital root of 5.
The canonical address for this page is /428.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value428
Digit count3
Digit sum14
Digital root5repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation2^2 × 107
Distinct prime factors22, 107
Number of divisors6
Sum of divisors σ(n)756
Aliquot sum328sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)212integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 2, 4, 107, 214, 4286 in total
Arithmetic
Representations
Decimal428
Binary1101011009 bits
Octal654
Hexadecimal1AC
Base 36BW
Roman numeralCDXXVIII
In wordsfour hundred and twenty-eight
Ordinalfour hundred and twenty-eighth
Scientific notation4.28 × 10^2
Engineering notation428
Nearest landmarks
Powers & multiples
428 to the power 2183,184
428 to the power 378,402,752
428 to the power 433,556,377,856
428 to the power 514,362,129,722,368
First ten multiples428, 856, 1,284, 1,712, 2,140, 2,568, 2,996, 3,424, 3,852, 4,280
Powers of twoBetween 2^8 (256) and 2^9 (512)
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 8No, remainder 4
Divisible by 9No, remainder 5
Divisible by 10No, remainder 8
Divisible by 11No, remainder 10
Divisible by 12No, remainder 8
Divisible by 100No, remainder 28
Collatz (3n + 1) trajectory
Steps to reach 1102the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps428 → 214 → 107 → 322 → 161 → 484 → 242 → 121 → 364 → 182 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage42,800%
428% as a decimal4.28
428% of 100428
428% of 1,0004,280
As a fraction of 100428/100
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Derived from 428
Other readings
Also reads as
#000428 (colour)
- #000428
- Blue
- Dark
- Nearest: Black
#000428 is a blue with RGB values 0, 4, 40 and HSL 234°, 100%, 8%. It is a dark colour, so white text on it reaches 20:1 contrast (AAA for normal text). The nearest named colour is Black.
Colour values
#000428#000428
HEX#000428
RGBrgb(0, 4, 40)
RGB (0–1)0, 0.0157, 0.1569
RGB percentages0%, 1.6%, 15.7%
HSLhsl(234, 100%, 7.8%)
HSV / HSBhsv(234, 100%, 15.7%)
CMYK100%, 90%, 0%, 84.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,064
CSS custom property--colour: #000428;
Brightness & contrast
Relative luminance0.0024WCAG 2.x, 0 is black and 1 is white
Perceived brightness13.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 20.04:1
Contrast with white20.04:1WCAG normal text: AAA
Contrast with black1.05:1WCAG normal text: Fail
Greyscale equivalent#060606
Inverted#FFFBD7
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text20.04:1WCAG large text: AAA
Contrast with black, large text1.05:1WCAG large text: Fail
Named colours
Hue familyblue
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#282400
Analogous#001828, #100028
Triadic#280004, #042800
Split complementary#281000, #182800
Tetradic#280018, #282400, #002810
Tints, shades & saturation
Channel breakdown
R0
G4
B40
Red0 (0%)
Green4 (1.6%)
Blue40 (15.7%)
Hue234°
Saturation (HSL)100%
Lightness7.84%
Dominant channelBlue
Hex per channelR 00 · G 04 · B 28
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Harmonies
Similar named colours
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