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What is the Least Common Multiple of 28200 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 28200 and 28220 is 39790200.

LCM(28200,28220) = 39790200

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Least Common Multiple of 28200 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 28200 and 28220, than apply into the LCM equation.

GCF(28200,28220) = 20
LCM(28200,28220) = ( 28200 × 28220) / 20
LCM(28200,28220) = 795804000 / 20
LCM(28200,28220) = 39790200

Least Common Multiple (LCM) of 28200 and 28220 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 28200 and 28220. First we will calculate the prime factors of 28200 and 28220.

Prime Factorization of 28200

Prime factors of 28200 are 2, 3, 5, 47. Prime factorization of 28200 in exponential form is:

28200 = 23 × 31 × 52 × 471

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 28200 and 28220.

LCM(28200,28220) = 23 × 31 × 52 × 471 × 171 × 831
LCM(28200,28220) = 39790200