Factors of 810
The factors of 810 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 54, 81, 90, 135, 162, 270, 405, 810. It has 20 factors.
Pick any whole number from 1 to 10,000.
How to work it out
- 1
A factor of 810 is a whole number that divides it with nothing left over. You only need to test the numbers up to √810 ≈ 28.46; every one that divides gives a pair.
- 2
The factor pairs are listed in the table below. Together they give 20 factors.
- 3
Prime factorisation: keep dividing by the smallest prime that fits.
- 4
Add all the factors: the sum is 2178. Without 810 itself that is 1368, so 810 is an abundant number.
LaTeX source of the formulas on this page
\[ 810 = 2 \times 3^{4} \times 5 \]Factor pairs of 810
| Factor | Pairs with | Product |
|---|---|---|
| 1 | 810 | 1 × 810 = 810 |
| 2 | 405 | 2 × 405 = 810 |
| 3 | 270 | 3 × 270 = 810 |
| 5 | 162 | 5 × 162 = 810 |
| 6 | 135 | 6 × 135 = 810 |
| 9 | 90 | 9 × 90 = 810 |
| 10 | 81 | 10 × 81 = 810 |
| 15 | 54 | 15 × 54 = 810 |
| 18 | 45 | 18 × 45 = 810 |
| 27 | 30 | 27 × 30 = 810 |
Questions
What are the factors of 810?
The factors of 810 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 54, 81, 90, 135, 162, 270, 405, 810. It has 20 factors.
What are the prime factors of 810?
2, 3, 5. As a product: 2 × × 5.
How many factors does 810 have?
810 has 20 factors (10 factor pairs).
What is the sum of the factors of 810?
2178.
Is 810 a prime number?
No. It is divisible by 2, so 810 = 2 × 405.