What is the Greatest Common Factor of 6405 and 6415?

Greatest common factor (GCF) of 6405 and 6415 is 5.

GCF(6405,6415) = 5

We will now calculate the prime factors of 6405 and 6415, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 6405 and 6415.

How to find the GCF of 6405 and 6415?

We will first find the prime factorization of 6405 and 6415. After we will calculate the factors of 6405 and 6415 and find the biggest common factor number .

Step-1: Prime Factorization of 6405

Prime factors of 6405 are 3, 5, 7, 61. Prime factorization of 6405 in exponential form is:

6405 = 3¹ × 5¹ × 7¹ × 61¹

Step-2: Prime Factorization of 6415

Prime factors of 6415 are 5, 1283. Prime factorization of 6415 in exponential form is:

6415 = 5¹ × 1283¹

Step-3: Factors of 6405

List of positive integer factors of 6405 that divides 6405 without a remainder.

1, 3, 5, 7, 15, 21, 35, 61, 105, 183, 305, 427, 915, 1281, 2135

Step-4: Factors of 6415

List of positive integer factors of 6415 that divides 6405 without a remainder.

1, 5, 1283

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 6405 and 6415. The biggest common factor number is the GCF number.
So the greatest common factor 6405 and 6415 is 5.

Also check out the Least Common Multiple of 6405 and 6415