Recognised as 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
Digit product64
Multiplicative persistence3times the digit product can be taken before one digit is left
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
Carmichael function λ(n)106the smallest exponent with aˣ ≡ 1 for every unit; smaller than φ(n) = 212
Möbius function μ(n)0zero, because a prime divides n twice
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
In other bases
Ternary120212base 3; the most digit-efficient integer base after e: 6 digits
Quinary3203base 5; one hand: 4 digits
Septenary1151base 7: 4 digits
Nonary525base 9; each digit is two ternary digits: 3 digits
Duodecimal2b8base 12; divides by 2, 3, 4 and 6, which is why eggs and inches come in twelves: 3 digits
Vigesimal118base 20; hands and feet, and the Mayan and Yoruba systems: 3 digits
Sexagesimal7:8base 60; Babylonian, and still how an hour and a circle are divided: 2 digits
Balanced ternary1TT10TTdigits −1, 0 and +1 written T, 0 and 1; negation is swapping T and 1, so no sign is needed
Negabinary11011111100base −2; place values alternate 1, −2, 4, −8, so every integer has exactly one form without a sign
Bit-level
0000000110101100
Bit length9 bitsto write the magnitude
Set bits5the population count, or Hamming weight
Zero bits4within that length
Bit parityodd5 set bits, so odd; not the same as the number itself being even
Highest set bitbit 8worth 256
Lowest set bitbit 22 trailing zeros
Power of twoNo
Bytes201 ac
Gray code101111010n XOR (n >> 1); successive values differ in exactly one bit
At each machine width
16-bit0000000110101100
32-bit00000000000000000000000110101100
64-bit0000000000000000000000000000000000000000000000000000000110101100
One's complement1111111001010011at 16 bits, every bit flipped
Bits reversed0011010110000000at 16 bits
Rotated left by 10000001101011000at 16 bits, wrapping
Shifted left by 11101011000= 856, no wrap
Shifted right by 111010110= 214, discarding the low bit
These bits as a double2.11460096 × 10^-321≈IEEE-754 binary64 reinterpretation of the same 64 bits (subnormal)
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
Read another way
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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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