What is the Greatest Common Factor of 561 and 570?

Greatest common factor (GCF) of 561 and 570 is 3.

GCF(561,570) = 3

We will now calculate the prime factors of 561 and 570, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 561 and 570.

How to find the GCF of 561 and 570?

We will first find the prime factorization of 561 and 570. After we will calculate the factors of 561 and 570 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 570

Prime factors of 570 are 2, 3, 5, 19. Prime factorization of 570 in exponential form is:

570 = 2¹ × 3¹ × 5¹ × 19¹

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 570

List of positive integer factors of 570 that divides 561 without a remainder.

1, 2, 3, 5, 6, 10, 15, 19, 30, 38, 57, 95, 114, 190, 285

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 561 and 570. The biggest common factor number is the GCF number.
So the greatest common factor 561 and 570 is 3.

Also check out the Least Common Multiple of 561 and 570