Factors of 721
The factors of 721 are 1, 7, 103, 721. It has 4 factors.
Factors of 721
Pick any whole number from 1 to 10,000.
How to work it out
- 1
A factor of 721 is a whole number that divides it with nothing left over. You only need to test the numbers up to ā721 ā 26.85; every one that divides gives a pair.
- 2
The factor pairs are listed in the table below. Together they give 4 factors.
- 3
Prime factorisation: keep dividing by the smallest prime that fits.
- 4
Add all the factors: 1 + 7 + 103 + 721 = 832. Without 721 itself that is 111, so 721 is a deficient number.
LaTeX source of the formulas on this page
\[ 721 = 7 \times 103 \]
Factor pairs of 721
| Factor | Pairs with | Product |
|---|---|---|
| 1 | 721 | 1 Ć 721 = 721 |
| 7 | 103 | 7 Ć 103 = 721 |
Questions
What are the factors of 721?
The factors of 721 are 1, 7, 103, 721. It has 4 factors.
What are the prime factors of 721?
7, 103. As a product: 7 Ć 103.
How many factors does 721 have?
721 has 4 factors (2 factor pairs).
What is the sum of the factors of 721?
832.
Is 721 a prime number?
No. It is divisible by 7, so 721 = 7 Ć 103.