# What is the Greatest Common Factor of 57 and 69?

Greatest common factor (GCF) of 57 and 69 is **3**.

GCF(57,69) = 3

We will now calculate the prime factors of **57 and 69**, than find the greatest common factor *(greatest common divisor (gcd))* of the numbers by matching the biggest common factor of 57 and 69.

## How to find the GCF of 57 and 69?

We will first find the prime factorization of 57 and 69. After we will calculate the factors of 57 and 69 and find the biggest common factor number .

### Step-1: Prime Factorization of 57

Prime factors of 57 are 3, 19. Prime factorization of **57** in exponential form is:

57 = 3^{1} × 19^{1}

### Step-2: Prime Factorization of 69

Prime factors of 69 are 3, 23. Prime factorization of **69** in exponential form is:

69 = 3^{1} × 23^{1}

### Step-3: Factors of 57

List of positive integer factors of 57 that divides 57 without a remainder.

1, 3, 19

### Step-4: Factors of 69

List of positive integer factors of 69 that divides 57 without a remainder.

1, 3, 23

#### Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 57 and 69. The biggest common factor number is the **GCF** number.

So the **greatest common factor 57 and 69** is **3**.

Also check out the Least Common Multiple of 57 and 69