Number
228
228 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 3
- Digit sum
- 12
- Digital root
- 3
- Palindrome
- No
- Divisor count
- 12
- σ(n) — sum of divisors
- 560
Primality
Prime factorization: 2 2 × 3 × 19
Divisors & multiples
Aliquot sum (sum of proper divisors):
332
Representations
- In words
- two hundred twenty-eight
- Ordinal
- 228th
- Roman numeral
- CCXXVIII
- Binary
- 11100100
- Octal
- 344
- Hexadecimal
- E4
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 228, here are decompositions:
- 5 + 223 = 228
- 17 + 211 = 228
- 29 + 199 = 228
- 31 + 197 = 228
- 37 + 191 = 228
- 47 + 181 = 228
- 61 + 167 = 228
- 71 + 157 = 228
Showing the first eight; more decompositions exist.
Unicode codepoint
ä
U+00E4
Lowercase letter (Ll)
UTF-8 encoding: C3 A4 (2 bytes).
Hex color
#0000E4
RGB(0, 0, 228)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.228.