What is the Least Common Multiple of 3620 and 3640?

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 3620 and 3640 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 3620 and 3640, than apply into the LCM equation.

GCF(3620,3640) = 20
LCM(3620,3640) = ( 3620 × 3640) / 20
LCM(3620,3640) = 13176800 / 20
LCM(3620,3640) = 658840

Least Common Multiple (LCM) of 3620 and 3640 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 3620 and 3640. First we will calculate the prime factors of 3620 and 3640.

Prime Factorization of 3620

Prime Factorization of 3640

Now multiplying the highest exponent prime factors to calculate the LCM of 3620 and 3640.

LCM(3620,3640) = 2³ × 5¹ × 181¹ × 7¹ × 13¹
LCM(3620,3640) = 658840