Number
25
25 is a composite number, odd, a calendar year.
Properties
- Parity
- Odd
- Digit count
- 2
- Digit sum
- 7
- Digital root
- 7
- Palindrome
- No
- Divisor count
- 3
- σ(n) — sum of divisors
- 31
Primality
Prime factorization: 5 2
Divisors & multiples
Aliquot sum (sum of proper divisors):
6
Representations
- In words
- twenty-five
- Ordinal
- 25th
- Roman numeral
- XXV
- Binary
- 11001
- Octal
- 31
- Hexadecimal
- 19
Also seen as
ASCII character
As an ASCII codepoint, 25 is control character (0x19). ASCII control character.
Network port
TCP/UDP port 25 is the well-known port for SMTP — Simple Mail Transfer Protocol.
Hex color
#000019
RGB(0, 0, 25)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.25.