What is the Greatest Common Factor of 85715 and 85720?

Greatest common factor (GCF) of 85715 and 85720 is 5.

GCF(85715,85720) = 5

We will now calculate the prime factors of 85715 and 85720, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 85715 and 85720.

How to find the GCF of 85715 and 85720?

We will first find the prime factorization of 85715 and 85720. After we will calculate the factors of 85715 and 85720 and find the biggest common factor number .

Step-1: Prime Factorization of 85715

Prime factors of 85715 are 5, 7, 31, 79. Prime factorization of 85715 in exponential form is:

85715 = 5¹ × 7¹ × 31¹ × 79¹

Step-2: Prime Factorization of 85720

Prime factors of 85720 are 2, 5, 2143. Prime factorization of 85720 in exponential form is:

85720 = 2³ × 5¹ × 2143¹

Step-3: Factors of 85715

List of positive integer factors of 85715 that divides 85715 without a remainder.

1, 5, 7, 31, 35, 79, 155, 217, 395, 553, 1085, 2449, 2765, 12245, 17143

Step-4: Factors of 85720

List of positive integer factors of 85720 that divides 85715 without a remainder.

1, 2, 4, 5, 8, 10, 20, 40, 2143, 4286, 8572, 10715, 17144, 21430, 42860

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 85715 and 85720. The biggest common factor number is the GCF number.
So the greatest common factor 85715 and 85720 is 5.

Also check out the Least Common Multiple of 85715 and 85720