What is the Greatest Common Factor of 25857 and 25870?

Greatest common factor (GCF) of 25857 and 25870 is 13.

GCF(25857,25870) = 13

We will now calculate the prime factors of 25857 and 25870, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 25857 and 25870.

How to find the GCF of 25857 and 25870?

We will first find the prime factorization of 25857 and 25870. After we will calculate the factors of 25857 and 25870 and find the biggest common factor number .

Step-1: Prime Factorization of 25857

Prime factors of 25857 are 3, 13, 17. Prime factorization of 25857 in exponential form is:

25857 = 3² × 13² × 17¹

Step-2: Prime Factorization of 25870

Prime factors of 25870 are 2, 5, 13, 199. Prime factorization of 25870 in exponential form is:

25870 = 2¹ × 5¹ × 13¹ × 199¹

Step-3: Factors of 25857

List of positive integer factors of 25857 that divides 25857 without a remainder.

1, 3, 9, 13, 17, 39, 51, 117, 153, 169, 221, 507, 663, 1521, 1989, 2873, 8619

Step-4: Factors of 25870

List of positive integer factors of 25870 that divides 25857 without a remainder.

1, 2, 5, 10, 13, 26, 65, 130, 199, 398, 995, 1990, 2587, 5174, 12935

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 25857 and 25870. The biggest common factor number is the GCF number.
So the greatest common factor 25857 and 25870 is 13.

Also check out the Least Common Multiple of 25857 and 25870