What is the Greatest Common Factor of 78620 and 78638?

Greatest common factor (GCF) of 78620 and 78638 is 2.

GCF(78620,78638) = 2

We will now calculate the prime factors of 78620 and 78638, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 78620 and 78638.

How to find the GCF of 78620 and 78638?

We will first find the prime factorization of 78620 and 78638. After we will calculate the factors of 78620 and 78638 and find the biggest common factor number .

Step-1: Prime Factorization of 78620

Prime factors of 78620 are 2, 5, 3931. Prime factorization of 78620 in exponential form is:

78620 = 2² × 5¹ × 3931¹

Step-2: Prime Factorization of 78638

Prime factors of 78638 are 2, 7, 41, 137. Prime factorization of 78638 in exponential form is:

78638 = 2¹ × 7¹ × 41¹ × 137¹

Step-3: Factors of 78620

List of positive integer factors of 78620 that divides 78620 without a remainder.

1, 2, 4, 5, 10, 20, 3931, 7862, 15724, 19655, 39310

Step-4: Factors of 78638

List of positive integer factors of 78638 that divides 78620 without a remainder.

1, 2, 7, 14, 41, 82, 137, 274, 287, 574, 959, 1918, 5617, 11234, 39319

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 78620 and 78638. The biggest common factor number is the GCF number.
So the greatest common factor 78620 and 78638 is 2.

Also check out the Least Common Multiple of 78620 and 78638