What is the Least Common Multiple of 78420 and 78436?

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 of 78420 and 78436 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 78420 and 78436, than apply into the LCM equation.

GCF(78420,78436) = 4
LCM(78420,78436) = ( 78420 × 78436) / 4
LCM(78420,78436) = 6150951120 / 4
LCM(78420,78436) = 1537737780

Least Common Multiple (LCM) of 78420 and 78436 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 78420 and 78436. First we will calculate the prime factors of 78420 and 78436.

Prime Factorization of 78420

Prime Factorization of 78436

Now multiplying the highest exponent prime factors to calculate the LCM of 78420 and 78436.

LCM(78420,78436) = 2² × 3¹ × 5¹ × 1307¹ × 19609¹
LCM(78420,78436) = 1537737780