What is the Greatest Common Factor of 28721 and 28728?

Greatest common factor (GCF) of 28721 and 28728 is 7.

GCF(28721,28728) = 7

We will now calculate the prime factors of 28721 and 28728, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 28721 and 28728.

How to find the GCF of 28721 and 28728?

We will first find the prime factorization of 28721 and 28728. After we will calculate the factors of 28721 and 28728 and find the biggest common factor number .

Step-1: Prime Factorization of 28721

Prime factors of 28721 are 7, 11, 373. Prime factorization of 28721 in exponential form is:

28721 = 7¹ × 11¹ × 373¹

Step-2: Prime Factorization of 28728

Prime factors of 28728 are 2, 3, 7, 19. Prime factorization of 28728 in exponential form is:

28728 = 2³ × 3³ × 7¹ × 19¹

Step-3: Factors of 28721

List of positive integer factors of 28721 that divides 28721 without a remainder.

1, 7, 11, 77, 373, 2611, 4103

Step-4: Factors of 28728

List of positive integer factors of 28728 that divides 28721 without a remainder.

1, 2, 3, 4, 6, 7, 8, 9, 12, 14, 18, 19, 21, 24, 27, 28, 36, 38, 42, 54, 56, 57, 63, 72, 76, 84, 108, 114, 126, 133, 152, 168, 171, 189, 216, 228, 252, 266, 342, 378, 399, 456, 504, 513, 532, 684, 756, 798, 1026, 1064, 1197, 1368, 1512, 1596, 2052, 2394, 3192, 3591, 4104, 4788, 7182, 9576, 14364

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 28721 and 28728. The biggest common factor number is the GCF number.
So the greatest common factor 28721 and 28728 is 7.

Also check out the Least Common Multiple of 28721 and 28728