What is the Greatest Common Factor of 621 and 637?

Greatest common factor (GCF) of 621 and 637 is 1.

GCF(621,637) = 1

We will now calculate the prime factors of 621 and 637, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 621 and 637.

How to find the GCF of 621 and 637?

We will first find the prime factorization of 621 and 637. After we will calculate the factors of 621 and 637 and find the biggest common factor number .

Step-1: Prime Factorization of 621

Prime factors of 621 are 3, 23. Prime factorization of 621 in exponential form is:

621 = 3³ × 23¹

Step-2: Prime Factorization of 637

Prime factors of 637 are 7, 13. Prime factorization of 637 in exponential form is:

637 = 7² × 13¹

Step-3: Factors of 621

List of positive integer factors of 621 that divides 621 without a remainder.

1, 3, 9, 23, 27, 69, 207

Step-4: Factors of 637

List of positive integer factors of 637 that divides 621 without a remainder.

1, 7, 13, 49, 91

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 621 and 637. The biggest common factor number is the GCF number.
So the greatest common factor 621 and 637 is 1.

Also check out the Least Common Multiple of 621 and 637