Factors of 128
The factors of 128 are 1, 2, 4, 8, 16, 32, 64, 128. It has 8 factors.
Factors of 128
Pick any whole number from 1 to 10,000.
How to work it out
- 1
A factor of 128 is a whole number that divides it with nothing left over. You only need to test the numbers up to √128 ≈ 11.31; 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 + 4 + 8 + 16 + 32 + 64 + 128 = 255. Without 128 itself that is 127, so 128 is a deficient number.
LaTeX source of the formulas on this page
\[ 128 = 2^{7} \]Factor pairs of 128
| Factor | Pairs with | Product |
|---|---|---|
| 1 | 128 | 1 × 128 = 128 |
| 2 | 64 | 2 × 64 = 128 |
| 4 | 32 | 4 × 32 = 128 |
| 8 | 16 | 8 × 16 = 128 |
Questions
What are the factors of 128?
The factors of 128 are 1, 2, 4, 8, 16, 32, 64, 128. It has 8 factors.
What are the prime factors of 128?
2. As a product: .
How many factors does 128 have?
128 has 8 factors (4 factor pairs).
What is the sum of the factors of 128?
255.
Is 128 a prime number?
No. It is divisible by 2, so 128 = 2 × 64.