Factors of 85
There are 4 factors of 85 — the full list is below, with factor pairs, prime factorization, and divisibility notes.
Factors of 85
1, 5, 17, 85
Factor pairs of 85
- 1 × 85
- 5 × 17
Prime factorization of 85
85 = 5 × 17
Number facts
- 85 is a composite number.
- 85 has 4 factors.
- 85 is not a perfect square.
- The sum of all factors of 85 is 108.
Divisibility rules that apply to 85
- 85 is divisible by 5 because it ends in 0 or 5.
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How the factors of 85 are calculated
To find the factors of 85, every whole number from 1 up to the square root of 85(about 9.22) is tested for even division. 85 is odd, and it divides evenly by 5, 17. Written as a product of primes, 85 = 5 × 17, which confirms every factor above is a combination of those prime building blocks.
Frequently asked questions about 85
How many factors does 85 have?
85 has 4 factors: 1, 5, 17, 85.
Is 85 a prime number?
No. 85 is composite because it has factors other than 1 and itself.
What are the factor pairs of 85?
The factor pairs of 85 are 1 × 85, 5 × 17.
What is the prime factorization of 85?
The prime factorization of 85 is 5 × 17.