Greatest Common Factor of 639 and 643

Created By : Jatin Gogia

Reviewed By : Rajasekhar Valipishetty

Last Updated : Apr 06, 2023

Make use of GCF Calculator to quickly find the Greatest Common Factor of numbers 639, 643 i.e. 1 largest integer by which both the numbers can be divided.

Greatest common factor (GCF) of 639 and 643 is 1.

GCF(639,643) = 1

GCF of 639 and 643

Greatest common factor or Greatest common divisor (GCD) can be calculated in following way;

GCF of:
and

Greatest Common Factor of 639 and 643

GCF of 639 and 643 is 1

Prime Factorization of 639


3 639
3 213
71 71
1

Prime factors of 639 are 3,71. Prime factorization of 639 in exponential form is:

639 = 32×711

Prime Factorization of 643


643 643
1

Prime factors of 643 are 643. Prime factorization of 643 in exponential form is:

643 = 6431

∴ So by taking common prime factors GCF of 639 and 643 is 1

Greatest Common Factor of 639 and 643 by matching factors method

Factors of 639

List of positive integer factors of 639 that divides 639 without a remainder.

1,3,9,71,213,639

Factors of 643

List of positive integer factors of 643 that divides 643 without a remainder.

1,643

Greatest Common Factor

We found the factors and prime factorization of 639 and 643. The biggest common factor number is the GCF number.
So the greatest common factor 639 and 643 is 1.

Also check out the Least Common Multiple of 639 and 643

Properties of GCF 639 and 643

(i) The GCF of 639 and 643 is associative

GCF of 639 and 643 = GCF of 643 and 639

Related Greatest Common Factor of 639

Related Greatest Common Factor of 643

Frequently Asked Questions on GCF of 639 and 643

1. What is the GCF of 639 and 643?

Answer: GCF of 639 and 643 is 1.

2. What are the Factors of 639?

Answer: Factors of 639 are 1, 3, 9, 71, 213, 639. There are 6 integers that are factors of 639. The greatest factor of 639 is 639.

3. What are the Factors of 643?

Answer: Factors of 643 are 1, 643. There are 2 integers that are factors of 643. The greatest factor of 643 is 643.

4. How to Find the GCF of 639 and 643?

Answer:

Greatest Common Factor of 639 and 643 = 1

Step 1: Find the prime factorization of 639

639 = 3 x 3 x 71

Step 2: Find the prime factorization of 643

643 = 643

Step 3: Multiply those factors both numbers have in common in steps i) or ii) above to find the gcf:

GCF = = 1

Step 4: Therefore, the greatest common factor of 639 and 643 is 1