84
84 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 2
- Digit sum
- 12
- Digital root
- 3
- Palindrome
- No
- Divisor count
- 12
- σ(n) — sum of divisors
- 224
Primality
Prime factorization: 2 2 × 3 × 7
Divisors & multiples
Representations
- In words
- eighty-four
- Ordinal
- 84th
- Roman numeral
- LXXXIV
- Binary
- 1010100
- Octal
- 124
- Hexadecimal
- 54
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 84, here are decompositions:
- 5 + 79 = 84
- 11 + 73 = 84
- 13 + 71 = 84
- 17 + 67 = 84
- 23 + 61 = 84
- 31 + 53 = 84
- 37 + 47 = 84
- 41 + 43 = 84
Showing the first eight; more decompositions exist.
As an ASCII codepoint, 84 is T. Printable ASCII character T.
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.84.
This passes the ABA routing number checksum and matches the Federal Reserve numbering scheme.
Banks operate many routing numbers per state and division; an unmatched checksum-valid number can still be a real RTN at a smaller institution.