What is the Greatest Common Factor of 780 and 798?

Greatest common factor (GCF) of 780 and 798 is 6.

GCF(780,798) = 6

We will now calculate the prime factors of 780 and 798, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 780 and 798.

How to find the GCF of 780 and 798?

We will first find the prime factorization of 780 and 798. After we will calculate the factors of 780 and 798 and find the biggest common factor number .

Step-1: Prime Factorization of 780

Prime factors of 780 are 2, 3, 5, 13. Prime factorization of 780 in exponential form is:

780 = 2² × 3¹ × 5¹ × 13¹

Step-2: Prime Factorization of 798

Prime factors of 798 are 2, 3, 7, 19. Prime factorization of 798 in exponential form is:

798 = 2¹ × 3¹ × 7¹ × 19¹

Step-3: Factors of 780

List of positive integer factors of 780 that divides 780 without a remainder.

1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390

Step-4: Factors of 798

List of positive integer factors of 798 that divides 780 without a remainder.

1, 2, 3, 6, 7, 14, 19, 21, 38, 42, 57, 114, 133, 266, 399

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 780 and 798. The biggest common factor number is the GCF number.
So the greatest common factor 780 and 798 is 6.

Also check out the Least Common Multiple of 780 and 798