What is the Greatest Common Factor of 780 and 786?

Greatest common factor (GCF) of 780 and 786 is 6.

GCF(780,786) = 6

We will now calculate the prime factors of 780 and 786, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 780 and 786.

How to find the GCF of 780 and 786?

We will first find the prime factorization of 780 and 786. After we will calculate the factors of 780 and 786 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 786

Prime factors of 786 are 2, 3, 131. Prime factorization of 786 in exponential form is:

786 = 2¹ × 3¹ × 131¹

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 786

List of positive integer factors of 786 that divides 780 without a remainder.

1, 2, 3, 6, 131, 262, 393

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 780 and 786. The biggest common factor number is the GCF number.
So the greatest common factor 780 and 786 is 6.

Also check out the Least Common Multiple of 780 and 786