What is the Greatest Common Factor of 78405 and 78421?

Greatest common factor (GCF) of 78405 and 78421 is 1.

GCF(78405,78421) = 1

We will now calculate the prime factors of 78405 and 78421, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 78405 and 78421.

How to find the GCF of 78405 and 78421?

We will first find the prime factorization of 78405 and 78421. After we will calculate the factors of 78405 and 78421 and find the biggest common factor number .

Step-1: Prime Factorization of 78405

Prime factors of 78405 are 3, 5, 5227. Prime factorization of 78405 in exponential form is:

78405 = 3¹ × 5¹ × 5227¹

Step-2: Prime Factorization of 78421

Prime factors of 78421 are 7, 17, 659. Prime factorization of 78421 in exponential form is:

78421 = 7¹ × 17¹ × 659¹

Step-3: Factors of 78405

List of positive integer factors of 78405 that divides 78405 without a remainder.

1, 3, 5, 15, 5227, 15681, 26135

Step-4: Factors of 78421

List of positive integer factors of 78421 that divides 78405 without a remainder.

1, 7, 17, 119, 659, 4613, 11203

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 78405 and 78421. The biggest common factor number is the GCF number.
So the greatest common factor 78405 and 78421 is 1.

Also check out the Least Common Multiple of 78405 and 78421