What is the Greatest Common Factor of 639 and 644?
Greatest common factor (GCF) of 639 and 644 is 1.
GCF(639,644) = 1
We will now calculate the prime factors of 639 and 644, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 639 and 644.
How to find the GCF of 639 and 644?
We will first find the prime factorization of 639 and 644. After we will calculate the factors of 639 and 644 and find the biggest common factor number .
Step-1: Prime Factorization of 639
Prime factors of 639 are 3, 71. Prime factorization of 639 in exponential form is:
639 = 32 × 711
Step-2: Prime Factorization of 644
Prime factors of 644 are 2, 7, 23. Prime factorization of 644 in exponential form is:
644 = 22 × 71 × 231
Step-3: Factors of 639
List of positive integer factors of 639 that divides 639 without a remainder.
1, 3, 9, 71, 213
Step-4: Factors of 644
List of positive integer factors of 644 that divides 639 without a remainder.
1, 2, 4, 7, 14, 23, 28, 46, 92, 161, 322
Final Step: Biggest Common Factor Number
We found the factors and prime factorization of 639 and 644. The biggest common factor number is the GCF number.
So the greatest common factor 639 and 644 is 1.
Also check out the Least Common Multiple of 639 and 644
Related Greatest Common Factors of 639
- GCF of 639 and 643
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Related Greatest Common Factors of 644
- GCF of 644 and 648
- GCF of 644 and 649
- GCF of 644 and 650
- GCF of 644 and 651
- GCF of 644 and 652
- GCF of 644 and 653
- GCF of 644 and 654
- GCF of 644 and 655
- GCF of 644 and 656
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