Factors of 128

All factors of 128

Here are all 8 factors of 128, listed from smallest to largest.

Factor pairs of 128

These 4 pairs of whole numbers each multiply to give 128.

Prime factorization of 128

Dividing 128 by the smallest prime at each step gives its prime factorization:

The distinct prime factors of 128 are 2. To factorize any other number, use the prime factorization calculator.

Factor tree of 128

A factor tree shows the same prime factorization visually. Each composite branch splits until every endpoint is a prime number.

Properties of 128

What makes 128 interesting

• 128 is a composite number, meaning it has more than two factors. It can be written as a product of smaller whole numbers in 4 different ways.
• 128 is a deficient number: its proper factors sum to 127, which is 1 less than 128 itself.
• 128 is a prime power: it is 2 raised to the power of 7. All of its factors are powers of 2.

How to find the factors of 128 yourself

Divide 128 by each whole number starting from 1. Whenever the division leaves no remainder, both the divisor and the quotient are factors. You only need to test up to √128 ≈ 11.31, because every factor above that pairs with one below it.

Reading both columns gives every factor: 1, 2, 4, 8, 16, 32, 64, 128. The factor calculator does this automatically for any number.