What is the Greatest Common Factor of 1605 and 1615?

Greatest common factor (GCF) of 1605 and 1615 is 5.

GCF(1605,1615) = 5

We will now calculate the prime factors of 1605 and 1615, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1605 and 1615.

How to find the GCF of 1605 and 1615?

We will first find the prime factorization of 1605 and 1615. After we will calculate the factors of 1605 and 1615 and find the biggest common factor number .

Step-1: Prime Factorization of 1605

Prime factors of 1605 are 3, 5, 107. Prime factorization of 1605 in exponential form is:

1605 = 3¹ × 5¹ × 107¹

Step-2: Prime Factorization of 1615

Prime factors of 1615 are 5, 17, 19. Prime factorization of 1615 in exponential form is:

1615 = 5¹ × 17¹ × 19¹

Step-3: Factors of 1605

List of positive integer factors of 1605 that divides 1605 without a remainder.

1, 3, 5, 15, 107, 321, 535

Step-4: Factors of 1615

List of positive integer factors of 1615 that divides 1605 without a remainder.

1, 5, 17, 19, 85, 95, 323

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1605 and 1615. The biggest common factor number is the GCF number.
So the greatest common factor 1605 and 1615 is 5.

Also check out the Least Common Multiple of 1605 and 1615