What is the Greatest Common Factor of 1780 and 1798?

Greatest common factor (GCF) of 1780 and 1798 is 2.

GCF(1780,1798) = 2

We will now calculate the prime factors of 1780 and 1798, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1780 and 1798.

How to find the GCF of 1780 and 1798?

We will first find the prime factorization of 1780 and 1798. After we will calculate the factors of 1780 and 1798 and find the biggest common factor number .

Step-1: Prime Factorization of 1780

Prime factors of 1780 are 2, 5, 89. Prime factorization of 1780 in exponential form is:

1780 = 2² × 5¹ × 89¹

Step-2: Prime Factorization of 1798

Prime factors of 1798 are 2, 29, 31. Prime factorization of 1798 in exponential form is:

1798 = 2¹ × 29¹ × 31¹

Step-3: Factors of 1780

List of positive integer factors of 1780 that divides 1780 without a remainder.

1, 2, 4, 5, 10, 20, 89, 178, 356, 445, 890

Step-4: Factors of 1798

List of positive integer factors of 1798 that divides 1780 without a remainder.

1, 2, 29, 31, 58, 62, 899

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1780 and 1798. The biggest common factor number is the GCF number.
So the greatest common factor 1780 and 1798 is 2.

Also check out the Least Common Multiple of 1780 and 1798