What is the Greatest Common Factor of 765 and 785?

Greatest common factor (GCF) of 765 and 785 is 5.

GCF(765,785) = 5

We will now calculate the prime factors of 765 and 785, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 765 and 785.

How to find the GCF of 765 and 785?

We will first find the prime factorization of 765 and 785. After we will calculate the factors of 765 and 785 and find the biggest common factor number .

Step-1: Prime Factorization of 765

Prime factors of 765 are 3, 5, 17. Prime factorization of 765 in exponential form is:

765 = 3² × 5¹ × 17¹

Step-2: Prime Factorization of 785

Prime factors of 785 are 5, 157. Prime factorization of 785 in exponential form is:

785 = 5¹ × 157¹

Step-3: Factors of 765

List of positive integer factors of 765 that divides 765 without a remainder.

1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 255

Step-4: Factors of 785

List of positive integer factors of 785 that divides 765 without a remainder.

1, 5, 157

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 765 and 785. The biggest common factor number is the GCF number.
So the greatest common factor 765 and 785 is 5.

Also check out the Least Common Multiple of 765 and 785