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Numbers / 255

The Number 255

255 is composite: factorization 3 × 5 × 17. That gives 255 exactly 8 divisors: 1, 3, 5, 15, 17, 51, 85, 255. 255's proper divisors total just 177, 78 short of 255, the deficient case most of 255's neighbors share too. 255 has a digit sum of 12; for 255, the digital root works out to 3. 255: 3, 5 all divide 255 evenly, out of 2-12. 255 is 11111111 in binary and FF in hex; as a Roman numeral it's CCLV.

Factors
1, 3, 5, 15, 17, 51, 85, 255
Number of factors
8
Prime?
No
Prime factorization
3 x 5 x 17
Even or odd
Odd
Square
65025
Cube
16581375
Binary
11111111
Hexadecimal
FF
Roman numeral
CCLV
Perfect square?
No
Perfect cube?
No
Perfect number?
No
Triangular number?
No
Fibonacci number?
No
Factors of 255 in detail →Is 255 prime? →