Factors of 78
There are 8 factors of 78 — the full list is below, with factor pairs, prime factorization, and divisibility notes.
Factors of 78
1, 2, 3, 6, 13, 26, 39, 78
Factor pairs of 78
- 1 × 78
- 2 × 39
- 3 × 26
- 6 × 13
Prime factorization of 78
78 = 2 × 3 × 13
Number facts
- 78 is a composite number.
- 78 has 8 factors.
- 78 is not a perfect square.
- The sum of all factors of 78 is 168.
Divisibility rules that apply to 78
- 78 is divisible by 2 because it ends in an even digit (0, 2, 4, 6, or 8).
- 78 is divisible by 3 because the sum of its digits (15) is divisible by 3.
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How the factors of 78 are calculated
To find the factors of 78, every whole number from 1 up to the square root of 78(about 8.83) is tested for even division. 78 is even, and it divides evenly by 2, 3, 6, 13, among others. Written as a product of primes, 78 = 2 × 3 × 13, which confirms every factor above is a combination of those prime building blocks.
Frequently asked questions about 78
How many factors does 78 have?
78 has 8 factors: 1, 2, 3, 6, 13, 26, 39, 78.
Is 78 a prime number?
No. 78 is composite because it has factors other than 1 and itself.
What are the factor pairs of 78?
The factor pairs of 78 are 1 × 78, 2 × 39, 3 × 26, 6 × 13.
What is the prime factorization of 78?
The prime factorization of 78 is 2 × 3 × 13.