Number
1,564
1,564 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 16
- Digital root
- 7
- Palindrome
- No
- Divisor count
- 12
- σ(n) — sum of divisors
- 3,024
Primality
Prime factorization: 2 2 × 17 × 23
Divisors & multiples
Aliquot sum (sum of proper divisors):
1,460
First multiples
Representations
- In words
- one thousand five hundred sixty-four
- Ordinal
- 1564th
- Roman numeral
- MDLXIV
- Binary
- 11000011100
- Octal
- 3034
- Hexadecimal
- 61C
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1564, here are decompositions:
- 5 + 1559 = 1564
- 11 + 1553 = 1564
- 41 + 1523 = 1564
- 53 + 1511 = 1564
- 71 + 1493 = 1564
- 83 + 1481 = 1564
- 113 + 1451 = 1564
- 131 + 1433 = 1564
Showing the first eight; more decompositions exist.
Unicode codepoint
U+061C
Format character (Cf)
UTF-8 encoding: D8 9C (2 bytes).
Hex color
#00061C
RGB(0, 6, 28)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.28.