What is the Greatest Common Factor of 81945 and 81965?

Greatest common factor (GCF) of 81945 and 81965 is 5.

GCF(81945,81965) = 5

We will now calculate the prime factors of 81945 and 81965, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 81945 and 81965.

How to find the GCF of 81945 and 81965?

We will first find the prime factorization of 81945 and 81965. After we will calculate the factors of 81945 and 81965 and find the biggest common factor number .

Step-1: Prime Factorization of 81945

Prime factors of 81945 are 3, 5, 607. Prime factorization of 81945 in exponential form is:

81945 = 3³ × 5¹ × 607¹

Step-2: Prime Factorization of 81965

Prime factors of 81965 are 5, 13, 97. Prime factorization of 81965 in exponential form is:

81965 = 5¹ × 13² × 97¹

Step-3: Factors of 81945

List of positive integer factors of 81945 that divides 81945 without a remainder.

1, 3, 5, 9, 15, 27, 45, 135, 607, 1821, 3035, 5463, 9105, 16389, 27315

Step-4: Factors of 81965

List of positive integer factors of 81965 that divides 81945 without a remainder.

1, 5, 13, 65, 97, 169, 485, 845, 1261, 6305, 16393

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 81945 and 81965. The biggest common factor number is the GCF number.
So the greatest common factor 81945 and 81965 is 5.

Also check out the Least Common Multiple of 81945 and 81965