Factors of 280
The factors of 280 are 1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280. It has 16 factors.
Pick any whole number from 1 to 10,000.
How to work it out
- 1
A factor of 280 is a whole number that divides it with nothing left over. You only need to test the numbers up to √280 ≈ 16.73; every one that divides gives a pair.
- 2
The factor pairs are listed in the table below. Together they give 16 factors.
- 3
Prime factorisation: keep dividing by the smallest prime that fits.
- 4
Add all the factors: the sum is 720. Without 280 itself that is 440, so 280 is an abundant number.
LaTeX source of the formulas on this page
\[ 280 = 2^{3} \times 5 \times 7 \]Factor pairs of 280
| Factor | Pairs with | Product |
|---|---|---|
| 1 | 280 | 1 × 280 = 280 |
| 2 | 140 | 2 × 140 = 280 |
| 4 | 70 | 4 × 70 = 280 |
| 5 | 56 | 5 × 56 = 280 |
| 7 | 40 | 7 × 40 = 280 |
| 8 | 35 | 8 × 35 = 280 |
| 10 | 28 | 10 × 28 = 280 |
| 14 | 20 | 14 × 20 = 280 |
Questions
What are the factors of 280?
The factors of 280 are 1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280. It has 16 factors.
What are the prime factors of 280?
2, 5, 7. As a product: × 5 × 7.
How many factors does 280 have?
280 has 16 factors (8 factor pairs).
What is the sum of the factors of 280?
720.
Is 280 a prime number?
No. It is divisible by 2, so 280 = 2 × 140.