# What is the Greatest Common Factor of 63 and 77?

Greatest common factor (GCF) of 63 and 77 is 7.

GCF(63,77) = 7

We will now calculate the prime factors of 63 and 77, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 63 and 77.

GCF Calculator and
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## How to find the GCF of 63 and 77?

We will first find the prime factorization of 63 and 77. After we will calculate the factors of 63 and 77 and find the biggest common factor number .

### Step-1: Prime Factorization of 63

Prime factors of 63 are 3, 7. Prime factorization of 63 in exponential form is:

63 = 32 × 71

### Step-2: Prime Factorization of 77

Prime factors of 77 are 7, 11. Prime factorization of 77 in exponential form is:

77 = 71 × 111

### Step-3: Factors of 63

List of positive integer factors of 63 that divides 63 without a remainder.

1, 3, 7, 9, 21

### Step-4: Factors of 77

List of positive integer factors of 77 that divides 63 without a remainder.

1, 7, 11

#### Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 63 and 77. The biggest common factor number is the GCF number.
So the greatest common factor 63 and 77 is 7.

Also check out the Least Common Multiple of 63 and 77