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What is the Least Common Multiple of 645 and 649?

Least common multiple or lowest common denominator (lcd) can be calculated in two way; with the LCM formula calculation of greatest common factor (GCF), or multiplying the prime factors with the highest exponent factor.

Least common multiple (LCM) of 645 and 649 is 418605.

LCM(645,649) = 418605

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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

Least Common Multiple (LCM) of 645 and 649 with Primes

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

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

645 = 31 × 51 × 431

Prime Factorization of 649

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