Least Common Multiple of 645 and 649

Created By : Jatin Gogia

Reviewed By : Rajasekhar Valipishetty

Last Updated : Apr 06, 2023

Free LCM Calculator determines the least common multiple (LCM) between 645 and 649 the smallest integer that is 418605 that is divisible by both numbers.

Least Common Multiple (LCM) of 645 and 649 is 418605.

LCM(645,649) = 418605

LCM of 645 and 649

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

LCM of:
and

Least Common Multiple of 645 and 649

LCM of 645 and 649 is 418605

Least common multiple can be found by multiplying the highest exponent prime factors of 645 and 649. First we will calculate the prime factors of 645 and 649.

Prime Factorization of 645


3 645
5 215
43 43
1

Prime factors of 645 are 3, 5,43. Prime factorization of 645 in exponential form is:

645 = 31×51×431

Prime Factorization of 649


11 649
59 59
1

Prime factors of 649 are 11,59. Prime factorization of 649 in exponential form is:

649 = 111×591

Now multiplying the highest exponent prime factors to calculate the LCM of 645 and 649.

LCM(645,649) = 31×51×111×431×591
LCM(645,649) = 418605

Factors of 645

List of positive integer factors of 645 that divides 645 without a remainder.

1, 3, 5, 15, 43, 129, 215, 645

Factors of 649

List of positive integer factors of 649 that divides 649 without a remainder.

1, 11, 59, 649

Least Common Multiple of 645 and 649 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 645 and 649, than apply into the LCM equation.

GCF(645,649) = 1
LCM(645,649) = ( 645 × 649) / 1
LCM(645,649) = 418605 / 1
LCM(645,649) = 418605

Properties of LCM 645 and 649

(i) The LCM of 649 and 645 is associative

LCM of 645 and 649 = LCM of 649 and 645

Related Least Common Multiples of 645

Related Least Common Multiples of 649

Frequently Asked Questions on LCM of 645 and 649

1. What is the LCM of 645 and 649?

Answer: LCM of 645 and 649 is 418605.

2. What are the Factors of 645?

Answer: Factors of 645 are 1, 3, 5, 15, 43, 129, 215, 645. There are 8 integers that are factors of 645. The greatest factor of 645 is 645.

3. What are the Factors of 649?

Answer: Factors of 649 are 1, 11, 59, 649. There are 4 integers that are factors of 649. The greatest factor of 649 is 649.

4. How to Find the LCM of 645 and 649?

Answer:

Least Common Multiple of 645 and 649 = 418605

Step 1: Find the prime factorization of 645

645 = 3 x 5 x 43

Step 2: Find the prime factorization of 649

649 = 11 x 59

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

LCM = 418605 = 3 x 5 x 11 x 43 x 59

Step 4: Therefore, the least common multiple of 645 and 649 is 418605.