Factors of 628

2, 157. As a product: 2^2 × 157.

The factors of 628 are 1, 2, 4, 157, 314, 628. It has 6 factors.

Factors of 628

Pick any whole number from 1 to 10,000.

628 = 2^{2} \times 157

How to work it out

1
A factor of 628 is a whole number that divides it with nothing left over. You only need to test the numbers up to √628 ≈ 25.06; every one that divides gives a pair.
2
The factor pairs are listed in the table below. Together they give 6 factors.
3
Prime factorisation: keep dividing by the smallest prime that fits.
$628 = 2^{2} \times 157$
4
Add all the factors: 1 + 2 + 4 + 157 + 314 + 628 = 1106. Without 628 itself that is 478, so 628 is a deficient number.

LaTeX source of the formulas on this page

\[ 628 = 2^{2} \times 157 \]

What are the factors of 628?

The factors of 628 are 1, 2, 4, 157, 314, 628. It has 6 factors.

What are the prime factors of 628?

2, 157. As a product: $2^{2}$ × 157.

How many factors does 628 have?

628 has 6 factors (3 factor pairs).

What is the sum of the factors of 628?

1106.

Is 628 a prime number?

No. It is divisible by 2, so 628 = 2 × 314.