What is the Greatest Common Factor of 7780 and 7785?

Greatest common factor (GCF) of 7780 and 7785 is 5.

GCF(7780,7785) = 5

We will now calculate the prime factors of 7780 and 7785, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 7780 and 7785.

How to find the GCF of 7780 and 7785?

We will first find the prime factorization of 7780 and 7785. After we will calculate the factors of 7780 and 7785 and find the biggest common factor number .

Step-1: Prime Factorization of 7780

Prime factors of 7780 are 2, 5, 389. Prime factorization of 7780 in exponential form is:

7780 = 2² × 5¹ × 389¹

Step-2: Prime Factorization of 7785

Prime factors of 7785 are 3, 5, 173. Prime factorization of 7785 in exponential form is:

7785 = 3² × 5¹ × 173¹

Step-3: Factors of 7780

List of positive integer factors of 7780 that divides 7780 without a remainder.

1, 2, 4, 5, 10, 20, 389, 778, 1556, 1945, 3890

Step-4: Factors of 7785

List of positive integer factors of 7785 that divides 7780 without a remainder.

1, 3, 5, 9, 15, 45, 173, 519, 865, 1557, 2595

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 7780 and 7785. The biggest common factor number is the GCF number.
So the greatest common factor 7780 and 7785 is 5.

Also check out the Least Common Multiple of 7780 and 7785