Number
1,664
1,664 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 17
- Digital root
- 8
- Palindrome
- No
- Divisor count
- 16
- σ(n) — sum of divisors
- 3,570
Primality
Prime factorization: 2 7 × 13
Divisors & multiples
Aliquot sum (sum of proper divisors):
1,906
First multiples
Representations
- In words
- one thousand six hundred sixty-four
- Ordinal
- 1664th
- Roman numeral
- MDCLXIV
- Binary
- 11010000000
- Octal
- 3200
- Hexadecimal
- 680
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1664, here are decompositions:
- 7 + 1657 = 1664
- 37 + 1627 = 1664
- 43 + 1621 = 1664
- 67 + 1597 = 1664
- 97 + 1567 = 1664
- 181 + 1483 = 1664
- 193 + 1471 = 1664
- 211 + 1453 = 1664
Showing the first eight; more decompositions exist.
Unicode codepoint
ڀ
U+0680
Other letter (Lo)
UTF-8 encoding: DA 80 (2 bytes).
Hex color
#000680
RGB(0, 6, 128)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.128.