What is the Greatest Common Factor of 428 and 445?

Greatest common factor (GCF) of 428 and 445 is 1.

GCF(428,445) = 1

We will now calculate the prime factors of 428 and 445, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 428 and 445.

How to find the GCF of 428 and 445?

We will first find the prime factorization of 428 and 445. After we will calculate the factors of 428 and 445 and find the biggest common factor number .

Step-1: Prime Factorization of 428

Prime factors of 428 are 2, 107. Prime factorization of 428 in exponential form is:

428 = 2² × 107¹

Step-2: Prime Factorization of 445

Prime factors of 445 are 5, 89. Prime factorization of 445 in exponential form is:

445 = 5¹ × 89¹

Step-3: Factors of 428

List of positive integer factors of 428 that divides 428 without a remainder.

1, 2, 4, 107, 214

Step-4: Factors of 445

List of positive integer factors of 445 that divides 428 without a remainder.

1, 5, 89

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 428 and 445. The biggest common factor number is the GCF number.
So the greatest common factor 428 and 445 is 1.

Also check out the Least Common Multiple of 428 and 445