What is the Greatest Common Factor of 684 and 688?

Greatest common factor (GCF) of 684 and 688 is 4.

GCF(684,688) = 4

We will now calculate the prime factors of 684 and 688, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 684 and 688.

How to find the GCF of 684 and 688?

We will first find the prime factorization of 684 and 688. After we will calculate the factors of 684 and 688 and find the biggest common factor number .

Step-1: Prime Factorization of 684

Prime factors of 684 are 2, 3, 19. Prime factorization of 684 in exponential form is:

684 = 2² × 3² × 19¹

Step-2: Prime Factorization of 688

Prime factors of 688 are 2, 43. Prime factorization of 688 in exponential form is:

688 = 2⁴ × 43¹

Step-3: Factors of 684

List of positive integer factors of 684 that divides 684 without a remainder.

1, 2, 3, 4, 6, 9, 12, 18, 19, 36, 38, 57, 76, 114, 171, 228, 342

Step-4: Factors of 688

List of positive integer factors of 688 that divides 684 without a remainder.

1, 2, 4, 8, 16, 43, 86, 172, 344

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 684 and 688. The biggest common factor number is the GCF number.
So the greatest common factor 684 and 688 is 4.

Also check out the Least Common Multiple of 684 and 688