What is the Greatest Common Factor of 778 and 790?

Greatest common factor (GCF) of 778 and 790 is 2.

GCF(778,790) = 2

We will now calculate the prime factors of 778 and 790, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 778 and 790.

How to find the GCF of 778 and 790?

We will first find the prime factorization of 778 and 790. After we will calculate the factors of 778 and 790 and find the biggest common factor number .

Step-1: Prime Factorization of 778

Prime factors of 778 are 2, 389. Prime factorization of 778 in exponential form is:

778 = 2¹ × 389¹

Step-2: Prime Factorization of 790

Prime factors of 790 are 2, 5, 79. Prime factorization of 790 in exponential form is:

790 = 2¹ × 5¹ × 79¹

Step-3: Factors of 778

List of positive integer factors of 778 that divides 778 without a remainder.

1, 2, 389

Step-4: Factors of 790

List of positive integer factors of 790 that divides 778 without a remainder.

1, 2, 5, 10, 79, 158, 395

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 778 and 790. The biggest common factor number is the GCF number.
So the greatest common factor 778 and 790 is 2.

Also check out the Least Common Multiple of 778 and 790