# Greatest Common Factor of 72 and 81

Greatest common factor (GCF) of 72 and 81 is 9.

GCF(72,81) = 9

We will now calculate the prime factors of 72 and 81, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 72 and 81.

GCF Calculator and

## Prime Factorization of 72

Prime factors of 72 are 2, 3. Prime factorization of 72 in exponential form is:

72 = 23 × 32

## Prime Factorization of 81

Prime factors of 81 are 3. Prime factorization of 81 in exponential form is:

81 = 34

### Factors of 72

List of positive integer factors of 72 that divides 72 without a remainder.

1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36

### Factors of 81

List of positive integer factors of 81 that divides 72 without a remainder.

1, 3, 9, 27

### Greatest Common Factor

We found the factors and prime factorization of 72 and 81. The biggest common factor number is the GCF number.
So the greatest common factor 72 and 81 is 9.

Also check out the Least Common Multiple of 72 and 81