Greatest Common Factor of 640 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 640, 643 i.e. 1 largest integer by which both the numbers can be divided.

Greatest common factor (GCF) of 640 and 643 is 1.

GCF(640,643) = 1

GCF of 640 and 643

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

GCF of:
and

Greatest Common Factor of 640 and 643

GCF of 640 and 643 is 1

Prime Factorization of 640


2 640
2 320
2 160
2 80
2 40
2 20
2 10
5 5
1

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

640 = 27×51

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 640 and 643 is 1

Greatest Common Factor of 640 and 643 by matching factors method

Factors of 640

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

1,2,4,5,8,10,16,20,32,40,64,80,128,160,320,640

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 640 and 643. The biggest common factor number is the GCF number.
So the greatest common factor 640 and 643 is 1.

Also check out the Least Common Multiple of 640 and 643

Properties of GCF 640 and 643

(i) The GCF of 640 and 643 is associative

GCF of 640 and 643 = GCF of 643 and 640

Related Greatest Common Factor of 640

Related Greatest Common Factor of 643

Frequently Asked Questions on GCF of 640 and 643

1. What is the GCF of 640 and 643?

Answer: GCF of 640 and 643 is 1.

2. What are the Factors of 640?

Answer: Factors of 640 are 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640. There are 16 integers that are factors of 640. The greatest factor of 640 is 640.

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 640 and 643?

Answer:

Greatest Common Factor of 640 and 643 = 1

Step 1: Find the prime factorization of 640

640 = 2 x 2 x 2 x 2 x 2 x 2 x 2 x 5

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 640 and 643 is 1