What is the Greatest Common Factor of 16 and 640?

Greatest common factor (GCF) of 16 and 640 is 16.

GCF(16,640) = 16

We will now calculate the prime factors of 16 and 640, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 16 and 640.

How to find the GCF of 16 and 640?

We will first find the prime factorization of 16 and 640. After we will calculate the factors of 16 and 640 and find the biggest common factor number .

Step-1: Prime Factorization of 16

Prime factors of 16 are 2. Prime factorization of 16 in exponential form is:

16 = 2⁴

Step-2: Prime Factorization of 640

Prime factors of 640 are 2, 5. Prime factorization of 640 in exponential form is:

640 = 2⁷ × 5¹

Step-3: Factors of 16

List of positive integer factors of 16 that divides 16 without a remainder.

1, 2, 4, 8

Step-4: Factors of 640

List of positive integer factors of 640 that divides 16 without a remainder.

1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 16 and 640. The biggest common factor number is the GCF number.
So the greatest common factor 16 and 640 is 16.

Also check out the Least Common Multiple of 16 and 640