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What is the Least Common Multiple of 7721 and 7740?

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 7721 and 7740 is 59760540.

LCM(7721,7740) = 59760540

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Least Common Multiple of 7721 and 7740 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 7721 and 7740, than apply into the LCM equation.

GCF(7721,7740) = 1
LCM(7721,7740) = ( 7721 × 7740) / 1
LCM(7721,7740) = 59760540 / 1
LCM(7721,7740) = 59760540

Least Common Multiple (LCM) of 7721 and 7740 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 7721 and 7740. First we will calculate the prime factors of 7721 and 7740.

Prime Factorization of 7721

Prime factors of 7721 are 7, 1103. Prime factorization of 7721 in exponential form is:

7721 = 71 × 11031

Prime Factorization of 7740

Prime factors of 7740 are 2, 3, 5, 43. Prime factorization of 7740 in exponential form is:

7740 = 22 × 32 × 51 × 431

Now multiplying the highest exponent prime factors to calculate the LCM of 7721 and 7740.

LCM(7721,7740) = 71 × 11031 × 22 × 32 × 51 × 431
LCM(7721,7740) = 59760540