Factors of 428

2, 107. As a product: 2^2 × 107.

The factors of 428 are 1, 2, 4, 107, 214, 428. It has 6 factors.

Factors of 428

Pick any whole number from 1 to 10,000.

428 = 2^{2} \times 107

How to work it out

1
A factor of 428 is a whole number that divides it with nothing left over. You only need to test the numbers up to √428 ≈ 20.69; 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.
$428 = 2^{2} \times 107$
4
Add all the factors: 1 + 2 + 4 + 107 + 214 + 428 = 756. Without 428 itself that is 328, so 428 is a deficient number.

LaTeX source of the formulas on this page

\[ 428 = 2^{2} \times 107 \]

What are the factors of 428?

The factors of 428 are 1, 2, 4, 107, 214, 428. It has 6 factors.

What are the prime factors of 428?

2, 107. As a product: $2^{2}$ × 107.

How many factors does 428 have?

428 has 6 factors (3 factor pairs).

What is the sum of the factors of 428?

756.

Is 428 a prime number?

No. It is divisible by 2, so 428 = 2 × 214.