What is the Greatest Common Factor of 626 and 640?

Greatest common factor (GCF) of 626 and 640 is 2.

GCF(626,640) = 2

We will now calculate the prime factors of 626 and 640, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 626 and 640.

How to find the GCF of 626 and 640?

We will first find the prime factorization of 626 and 640. After we will calculate the factors of 626 and 640 and find the biggest common factor number .

Step-1: Prime Factorization of 626

Prime factors of 626 are 2, 313. Prime factorization of 626 in exponential form is:

626 = 2¹ × 313¹

Step-2: Prime Factorization of 640

Prime factors of 640 are 2, 5. Prime factorization of 640 in exponential form is:

640 = 2⁷ × 5¹

Step-3: Factors of 626

List of positive integer factors of 626 that divides 626 without a remainder.

1, 2, 313

Step-4: Factors of 640

List of positive integer factors of 640 that divides 626 without a remainder.

1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 626 and 640. The biggest common factor number is the GCF number.
So the greatest common factor 626 and 640 is 2.

Also check out the Least Common Multiple of 626 and 640