What is the Greatest Common Factor of 561 and 578?

Greatest common factor (GCF) of 561 and 578 is 17.

GCF(561,578) = 17

We will now calculate the prime factors of 561 and 578, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 561 and 578.

How to find the GCF of 561 and 578?

We will first find the prime factorization of 561 and 578. After we will calculate the factors of 561 and 578 and find the biggest common factor number .

Step-1: Prime Factorization of 561

Prime factors of 561 are 3, 11, 17. Prime factorization of 561 in exponential form is:

561 = 3¹ × 11¹ × 17¹

Step-2: Prime Factorization of 578

Prime factors of 578 are 2, 17. Prime factorization of 578 in exponential form is:

578 = 2¹ × 17²

Step-3: Factors of 561

List of positive integer factors of 561 that divides 561 without a remainder.

1, 3, 11, 17, 33, 51, 187

Step-4: Factors of 578

List of positive integer factors of 578 that divides 561 without a remainder.

1, 2, 17, 34, 289

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 561 and 578. The biggest common factor number is the GCF number.
So the greatest common factor 561 and 578 is 17.

Also check out the Least Common Multiple of 561 and 578