What is the Greatest Common Factor of 638 and 646?
Greatest common factor (GCF) of 638 and 646 is 2.
GCF(638,646) = 2
We will now calculate the prime factors of 638 and 646, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 638 and 646.
How to find the GCF of 638 and 646?
We will first find the prime factorization of 638 and 646. After we will calculate the factors of 638 and 646 and find the biggest common factor number .
Step-1: Prime Factorization of 638
Prime factors of 638 are 2, 11, 29. Prime factorization of 638 in exponential form is:
638 = 21 × 111 × 291
Step-2: Prime Factorization of 646
Prime factors of 646 are 2, 17, 19. Prime factorization of 646 in exponential form is:
646 = 21 × 171 × 191
Step-3: Factors of 638
List of positive integer factors of 638 that divides 638 without a remainder.
1, 2, 11, 22, 29, 58, 319
Step-4: Factors of 646
List of positive integer factors of 646 that divides 638 without a remainder.
1, 2, 17, 19, 34, 38, 323
Final Step: Biggest Common Factor Number
We found the factors and prime factorization of 638 and 646. The biggest common factor number is the GCF number.
So the greatest common factor 638 and 646 is 2.
Also check out the Least Common Multiple of 638 and 646
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Related Greatest Common Factors of 646
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