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What is the Least Common Multiple of 1645 and 1656?

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 1645 and 1656 is 2724120.

LCM(1645,1656) = 2724120

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Least Common Multiple of 1645 and 1656 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1645 and 1656, than apply into the LCM equation.

GCF(1645,1656) = 1
LCM(1645,1656) = ( 1645 × 1656) / 1
LCM(1645,1656) = 2724120 / 1
LCM(1645,1656) = 2724120

Least Common Multiple (LCM) of 1645 and 1656 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1645 and 1656. First we will calculate the prime factors of 1645 and 1656.

Prime Factorization of 1645

Prime factors of 1645 are 5, 7, 47. Prime factorization of 1645 in exponential form is:

1645 = 51 × 71 × 471

Prime Factorization of 1656

Prime factors of 1656 are 2, 3, 23. Prime factorization of 1656 in exponential form is:

1656 = 23 × 32 × 231

Now multiplying the highest exponent prime factors to calculate the LCM of 1645 and 1656.

LCM(1645,1656) = 51 × 71 × 471 × 23 × 32 × 231
LCM(1645,1656) = 2724120