What is the Greatest Common Factor of 27990 and 28008?

Greatest common factor (GCF) of 27990 and 28008 is 18.

GCF(27990,28008) = 18

We will now calculate the prime factors of 27990 and 28008, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 27990 and 28008.

How to find the GCF of 27990 and 28008?

We will first find the prime factorization of 27990 and 28008. After we will calculate the factors of 27990 and 28008 and find the biggest common factor number .

Step-1: Prime Factorization of 27990

Prime factors of 27990 are 2, 3, 5, 311. Prime factorization of 27990 in exponential form is:

27990 = 2¹ × 3² × 5¹ × 311¹

Step-2: Prime Factorization of 28008

Prime factors of 28008 are 2, 3, 389. Prime factorization of 28008 in exponential form is:

28008 = 2³ × 3² × 389¹

Step-3: Factors of 27990

List of positive integer factors of 27990 that divides 27990 without a remainder.

1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90, 311, 622, 933, 1555, 1866, 2799, 3110, 4665, 5598, 9330, 13995

Step-4: Factors of 28008

List of positive integer factors of 28008 that divides 27990 without a remainder.

1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72, 389, 778, 1167, 1556, 2334, 3112, 3501, 4668, 7002, 9336, 14004

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 27990 and 28008. The biggest common factor number is the GCF number.
So the greatest common factor 27990 and 28008 is 18.

Also check out the Least Common Multiple of 27990 and 28008