Factors of 642
The factors of 642 are 1, 2, 3, 6, 107, 214, 321, 642. It has 8 factors.
Factors of 642
Pick any whole number from 1 to 10,000.
How to work it out
- 1
A factor of 642 is a whole number that divides it with nothing left over. You only need to test the numbers up to √642 ≈ 25.34; 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 + 107 + 214 + 321 + 642 = 1296. Without 642 itself that is 654, so 642 is an abundant number.
LaTeX source of the formulas on this page
\[ 642 = 2 \times 3 \times 107 \]
Factor pairs of 642
| Factor | Pairs with | Product |
|---|---|---|
| 1 | 642 | 1 × 642 = 642 |
| 2 | 321 | 2 × 321 = 642 |
| 3 | 214 | 3 × 214 = 642 |
| 6 | 107 | 6 × 107 = 642 |
Questions
What are the factors of 642?
The factors of 642 are 1, 2, 3, 6, 107, 214, 321, 642. It has 8 factors.
What are the prime factors of 642?
2, 3, 107. As a product: 2 × 3 × 107.
How many factors does 642 have?
642 has 8 factors (4 factor pairs).
What is the sum of the factors of 642?
1296.
Is 642 a prime number?
No. It is divisible by 2, so 642 = 2 × 321.