What is the Greatest Common Factor of 1378 and 1390?

Greatest common factor (GCF) of 1378 and 1390 is 2.

GCF(1378,1390) = 2

We will now calculate the prime factors of 1378 and 1390, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1378 and 1390.

How to find the GCF of 1378 and 1390?

We will first find the prime factorization of 1378 and 1390. After we will calculate the factors of 1378 and 1390 and find the biggest common factor number .

Step-1: Prime Factorization of 1378

Prime factors of 1378 are 2, 13, 53. Prime factorization of 1378 in exponential form is:

1378 = 2¹ × 13¹ × 53¹

Step-2: Prime Factorization of 1390

Prime factors of 1390 are 2, 5, 139. Prime factorization of 1390 in exponential form is:

1390 = 2¹ × 5¹ × 139¹

Step-3: Factors of 1378

List of positive integer factors of 1378 that divides 1378 without a remainder.

1, 2, 13, 26, 53, 106, 689

Step-4: Factors of 1390

List of positive integer factors of 1390 that divides 1378 without a remainder.

1, 2, 5, 10, 139, 278, 695

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1378 and 1390. The biggest common factor number is the GCF number.
So the greatest common factor 1378 and 1390 is 2.

Also check out the Least Common Multiple of 1378 and 1390