What is the Greatest Common Factor of 15615 and 15621?

Greatest common factor (GCF) of 15615 and 15621 is 3.

GCF(15615,15621) = 3

We will now calculate the prime factors of 15615 and 15621, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 15615 and 15621.

How to find the GCF of 15615 and 15621?

We will first find the prime factorization of 15615 and 15621. After we will calculate the factors of 15615 and 15621 and find the biggest common factor number .

Step-1: Prime Factorization of 15615

Prime factors of 15615 are 3, 5, 347. Prime factorization of 15615 in exponential form is:

15615 = 3² × 5¹ × 347¹

Step-2: Prime Factorization of 15621

Prime factors of 15621 are 3, 41, 127. Prime factorization of 15621 in exponential form is:

15621 = 3¹ × 41¹ × 127¹

Step-3: Factors of 15615

List of positive integer factors of 15615 that divides 15615 without a remainder.

1, 3, 5, 9, 15, 45, 347, 1041, 1735, 3123, 5205

Step-4: Factors of 15621

List of positive integer factors of 15621 that divides 15615 without a remainder.

1, 3, 41, 123, 127, 381, 5207

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 15615 and 15621. The biggest common factor number is the GCF number.
So the greatest common factor 15615 and 15621 is 3.

Also check out the Least Common Multiple of 15615 and 15621