What is the Greatest Common Factor of 15861 and 15878?

Greatest common factor (GCF) of 15861 and 15878 is 17.

GCF(15861,15878) = 17

We will now calculate the prime factors of 15861 and 15878, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 15861 and 15878.

How to find the GCF of 15861 and 15878?

We will first find the prime factorization of 15861 and 15878. After we will calculate the factors of 15861 and 15878 and find the biggest common factor number .

Step-1: Prime Factorization of 15861

Prime factors of 15861 are 3, 17, 311. Prime factorization of 15861 in exponential form is:

15861 = 3¹ × 17¹ × 311¹

Step-2: Prime Factorization of 15878

Prime factors of 15878 are 2, 17, 467. Prime factorization of 15878 in exponential form is:

15878 = 2¹ × 17¹ × 467¹

Step-3: Factors of 15861

List of positive integer factors of 15861 that divides 15861 without a remainder.

1, 3, 17, 51, 311, 933, 5287

Step-4: Factors of 15878

List of positive integer factors of 15878 that divides 15861 without a remainder.

1, 2, 17, 34, 467, 934, 7939

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 15861 and 15878. The biggest common factor number is the GCF number.
So the greatest common factor 15861 and 15878 is 17.

Also check out the Least Common Multiple of 15861 and 15878