What is the Greatest Common Factor of 85815 and 85821?

Greatest common factor (GCF) of 85815 and 85821 is 3.

GCF(85815,85821) = 3

We will now calculate the prime factors of 85815 and 85821, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 85815 and 85821.

How to find the GCF of 85815 and 85821?

We will first find the prime factorization of 85815 and 85821. After we will calculate the factors of 85815 and 85821 and find the biggest common factor number .

Step-1: Prime Factorization of 85815

Prime factors of 85815 are 3, 5, 1907. Prime factorization of 85815 in exponential form is:

85815 = 3² × 5¹ × 1907¹

Step-2: Prime Factorization of 85821

Prime factors of 85821 are 3, 28607. Prime factorization of 85821 in exponential form is:

85821 = 3¹ × 28607¹

Step-3: Factors of 85815

List of positive integer factors of 85815 that divides 85815 without a remainder.

1, 3, 5, 9, 15, 45, 1907, 5721, 9535, 17163, 28605

Step-4: Factors of 85821

List of positive integer factors of 85821 that divides 85815 without a remainder.

1, 3, 28607

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 85815 and 85821. The biggest common factor number is the GCF number.
So the greatest common factor 85815 and 85821 is 3.

Also check out the Least Common Multiple of 85815 and 85821