Number
828
828 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 3
- Digit sum
- 18
- Digital root
- 9
- Palindrome
- Yes
- Divisor count
- 18
- σ(n) — sum of divisors
- 2,184
Primality
Prime factorization: 2 2 × 3 2 × 23
Divisors & multiples
All divisors (18)
Aliquot sum (sum of proper divisors):
1,356
Representations
- In words
- eight hundred twenty-eight
- Ordinal
- 828th
- Roman numeral
- DCCCXXVIII
- Binary
- 1100111100
- Octal
- 1474
- Hexadecimal
- 33C
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 828, here are decompositions:
- 5 + 823 = 828
- 7 + 821 = 828
- 17 + 811 = 828
- 19 + 809 = 828
- 31 + 797 = 828
- 41 + 787 = 828
- 59 + 769 = 828
- 67 + 761 = 828
Showing the first eight; more decompositions exist.
Unicode codepoint
̼
U+033C
Non-spacing mark (Mn)
UTF-8 encoding: CC BC (2 bytes).
Hex color
#00033C
RGB(0, 3, 60)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.60.