What is the Greatest Common Factor of 81639 and 81645?

Greatest common factor (GCF) of 81639 and 81645 is 3.

GCF(81639,81645) = 3

We will now calculate the prime factors of 81639 and 81645, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 81639 and 81645.

How to find the GCF of 81639 and 81645?

We will first find the prime factorization of 81639 and 81645. After we will calculate the factors of 81639 and 81645 and find the biggest common factor number .

Step-1: Prime Factorization of 81639

Prime factors of 81639 are 3, 47, 193. Prime factorization of 81639 in exponential form is:

81639 = 3² × 47¹ × 193¹

Step-2: Prime Factorization of 81645

Prime factors of 81645 are 3, 5, 5443. Prime factorization of 81645 in exponential form is:

81645 = 3¹ × 5¹ × 5443¹

Step-3: Factors of 81639

List of positive integer factors of 81639 that divides 81639 without a remainder.

1, 3, 9, 47, 141, 193, 423, 579, 1737, 9071, 27213

Step-4: Factors of 81645

List of positive integer factors of 81645 that divides 81639 without a remainder.

1, 3, 5, 15, 5443, 16329, 27215

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 81639 and 81645. The biggest common factor number is the GCF number.
So the greatest common factor 81639 and 81645 is 3.

Also check out the Least Common Multiple of 81639 and 81645