Factors of 78
The factors of 78 are 1, 2, 3, 6, 13, 26, 39, 78. It has 8 factors.
Factors of 78
Pick any whole number from 1 to 10,000.
How to work it out
- 1
A factor of 78 is a whole number that divides it with nothing left over. You only need to test the numbers up to √78 ≈ 8.83; every one that divides gives a pair.
- 2
The factor pairs are listed in the table below. Together they give 8 factors.
- 3
Prime factorisation: keep dividing by the smallest prime that fits.
- 4
Add all the factors: 1 + 2 + 3 + 6 + 13 + 26 + 39 + 78 = 168. Without 78 itself that is 90, so 78 is an abundant number.
LaTeX source of the formulas on this page
\[ 78 = 2 \times 3 \times 13 \]
Factor pairs of 78
| Factor | Pairs with | Product |
|---|---|---|
| 1 | 78 | 1 × 78 = 78 |
| 2 | 39 | 2 × 39 = 78 |
| 3 | 26 | 3 × 26 = 78 |
| 6 | 13 | 6 × 13 = 78 |
Questions
What are the factors of 78?
The factors of 78 are 1, 2, 3, 6, 13, 26, 39, 78. It has 8 factors.
What are the prime factors of 78?
2, 3, 13. As a product: 2 × 3 × 13.
How many factors does 78 have?
78 has 8 factors (4 factor pairs).
What is the sum of the factors of 78?
168.
Is 78 a prime number?
No. It is divisible by 2, so 78 = 2 × 39.