Least Common Multiple of 639 and 644

Created By : Jatin Gogia

Reviewed By : Rajasekhar Valipishetty

Last Updated : Apr 06, 2023

Free LCM Calculator determines the least common multiple (LCM) between 639 and 644 the smallest integer that is 411516 that is divisible by both numbers.

Least Common Multiple (LCM) of 639 and 644 is 411516.

LCM(639,644) = 411516

LCM of 639 and 644

Least common multiple or lowest common denominator (LCD) can be calculated in three ways;

LCM of:
and

Least Common Multiple of 639 and 644

LCM of 639 and 644 is 411516

Least common multiple can be found by multiplying the highest exponent prime factors of 639 and 644. First we will calculate the prime factors of 639 and 644.

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 644


2 644
2 322
7 161
23 23
1

Prime factors of 644 are 2, 7,23. Prime factorization of 644 in exponential form is:

644 = 22×71×231

Now multiplying the highest exponent prime factors to calculate the LCM of 639 and 644.

LCM(639,644) = 22×32×71×231×711
LCM(639,644) = 411516

Factors of 639

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

1, 3, 9, 71, 213, 639

Factors of 644

List of positive integer factors of 644 that divides 644 without a remainder.

1, 2, 4, 7, 14, 23, 28, 46, 92, 161, 322, 644

Least Common Multiple of 639 and 644 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 639 and 644, than apply into the LCM equation.

GCF(639,644) = 1
LCM(639,644) = ( 639 × 644) / 1
LCM(639,644) = 411516 / 1
LCM(639,644) = 411516

Properties of LCM 639 and 644

(i) The LCM of 644 and 639 is associative

LCM of 639 and 644 = LCM of 644 and 639

Related Least Common Multiples of 639

Related Least Common Multiples of 644

Frequently Asked Questions on LCM of 639 and 644

1. What is the LCM of 639 and 644?

Answer: LCM of 639 and 644 is 411516.

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 644?

Answer: Factors of 644 are 1, 2, 4, 7, 14, 23, 28, 46, 92, 161, 322, 644. There are 12 integers that are factors of 644. The greatest factor of 644 is 644.

4. How to Find the LCM of 639 and 644?

Answer:

Least Common Multiple of 639 and 644 = 411516

Step 1: Find the prime factorization of 639

639 = 3 x 3 x 71

Step 2: Find the prime factorization of 644

644 = 2 x 2 x 7 x 23

Step 3: Multiply each factor the greater number of times it occurs in steps i) or ii) above to find the lcm:

LCM = 411516 = 2 x 2 x 3 x 3 x 7 x 23 x 71

Step 4: Therefore, the least common multiple of 639 and 644 is 411516.