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What is the Least Common Multiple of 644 and 661?

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 644 and 661 is 425684.

LCM(644,661) = 425684

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Least Common Multiple of 644 and 661 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 644 and 661, than apply into the LCM equation.

GCF(644,661) = 1
LCM(644,661) = ( 644 × 661) / 1
LCM(644,661) = 425684 / 1
LCM(644,661) = 425684

Least Common Multiple (LCM) of 644 and 661 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 644 and 661. First we will calculate the prime factors of 644 and 661.

Prime Factorization of 644

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

644 = 22 × 71 × 231

Prime Factorization of 661

Prime factors of 661 are 661. Prime factorization of 661 in exponential form is:

661 = 6611

Now multiplying the highest exponent prime factors to calculate the LCM of 644 and 661.

LCM(644,661) = 22 × 71 × 231 × 6611
LCM(644,661) = 425684