645
Number 645 properties
- 645 is an odd number.
- 645 is a Harshad number, which means it is divisible by the sum of its digits (645 = 15, and 645 is divisible by 15).
Number 645 - properties and curiosities
645 (number)
Prime factorization
Prime factorization of 645: 3 × 5 × 43.
Divisors
Divisor count: 8
1, 3, 5, 15, 43, 129, 215, 645
Factors of 645 are: 1, 3, 5, 15, 43, 129, 215, 645.
Representations
In octal, 645 is represented as 1205.
In binary, 645 is represented as 1010000101.
In hex, 645 is represented as 285.
Roman numeral: DCXLV
Curiosities
- 645 is divisible by the sum of its digits.
Related numbers
Quick answers
Is 645 prime?
No, 645 is not prime.
What are the factors of 645?
1, 3, 5, 15, 43, 129, 215, 645
What is 645 in binary?
1010000101