What is the Greatest Common Factor of 42400 and 42405?

Greatest common factor (GCF) of 42400 and 42405 is 5.

GCF(42400,42405) = 5

We will now calculate the prime factors of 42400 and 42405, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 42400 and 42405.

How to find the GCF of 42400 and 42405?

We will first find the prime factorization of 42400 and 42405. After we will calculate the factors of 42400 and 42405 and find the biggest common factor number .

Step-1: Prime Factorization of 42400

Prime factors of 42400 are 2, 5, 53. Prime factorization of 42400 in exponential form is:

42400 = 2⁵ × 5² × 53¹

Step-2: Prime Factorization of 42405

Prime factors of 42405 are 3, 5, 11, 257. Prime factorization of 42405 in exponential form is:

42405 = 3¹ × 5¹ × 11¹ × 257¹

Step-3: Factors of 42400

List of positive integer factors of 42400 that divides 42400 without a remainder.

1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 53, 80, 100, 106, 160, 200, 212, 265, 400, 424, 530, 800, 848, 1060, 1325, 1696, 2120, 2650, 4240, 5300, 8480, 10600, 21200

Step-4: Factors of 42405

List of positive integer factors of 42405 that divides 42400 without a remainder.

1, 3, 5, 11, 15, 33, 55, 165, 257, 771, 1285, 2827, 3855, 8481, 14135

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 42400 and 42405. The biggest common factor number is the GCF number.
So the greatest common factor 42400 and 42405 is 5.

Also check out the Least Common Multiple of 42400 and 42405