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What is the Least Common Multiple of 28215 and 28220?

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 28215 and 28220 is 159245460.

LCM(28215,28220) = 159245460

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Least Common Multiple of 28215 and 28220 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 28215 and 28220, than apply into the LCM equation.

GCF(28215,28220) = 5
LCM(28215,28220) = ( 28215 × 28220) / 5
LCM(28215,28220) = 796227300 / 5
LCM(28215,28220) = 159245460

Least Common Multiple (LCM) of 28215 and 28220 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 28215 and 28220. First we will calculate the prime factors of 28215 and 28220.

Prime Factorization of 28215

Prime factors of 28215 are 3, 5, 11, 19. Prime factorization of 28215 in exponential form is:

28215 = 33 × 51 × 111 × 191

Prime Factorization of 28220

Prime factors of 28220 are 2, 5, 17, 83. Prime factorization of 28220 in exponential form is:

28220 = 22 × 51 × 171 × 831

Now multiplying the highest exponent prime factors to calculate the LCM of 28215 and 28220.

LCM(28215,28220) = 33 × 51 × 111 × 191 × 22 × 171 × 831
LCM(28215,28220) = 159245460