Factors of 63

All factors of 63

Here are all 6 factors of 63, listed from smallest to largest.

Factor pairs of 63

These 3 pairs of whole numbers each multiply to give 63.

Prime factorization of 63

Dividing 63 by the smallest prime at each step gives its prime factorization:

The distinct prime factors of 63 are 3, 7. To factorize any other number, use the prime factorization calculator.

Factor tree of 63

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

Properties of 63

What makes 63 interesting

• 63 is a composite number, meaning it has more than two factors. It can be written as a product of smaller whole numbers in 3 different ways.
• 63 is a deficient number: its proper factors sum to 41, which is 22 less than 63 itself.

How to find the factors of 63 yourself

Divide 63 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 √63 ≈ 7.94, because every factor above that pairs with one below it.

Reading both columns gives every factor: 1, 3, 7, 9, 21, 63. The factor calculator does this automatically for any number.