Factors of 57
There are 4 factors of 57 — the full list is below, with factor pairs, prime factorization, and divisibility notes.
Factors of 57
1, 3, 19, 57
Factor pairs of 57
- 1 × 57
- 3 × 19
Prime factorization of 57
57 = 3 × 19
Number facts
- 57 is a composite number.
- 57 has 4 factors.
- 57 is not a perfect square.
- The sum of all factors of 57 is 80.
Divisibility rules that apply to 57
- 57 is divisible by 3 because the sum of its digits (12) is divisible by 3.
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How the factors of 57 are calculated
To find the factors of 57, every whole number from 1 up to the square root of 57(about 7.55) is tested for even division. 57 is odd, and it divides evenly by 3, 19. Written as a product of primes, 57 = 3 × 19, which confirms every factor above is a combination of those prime building blocks.
Frequently asked questions about 57
How many factors does 57 have?
57 has 4 factors: 1, 3, 19, 57.
Is 57 a prime number?
No. 57 is composite because it has factors other than 1 and itself.
What are the factor pairs of 57?
The factor pairs of 57 are 1 × 57, 3 × 19.
What is the prime factorization of 57?
The prime factorization of 57 is 3 × 19.