What is the Least Common Multiple of 81991 and 82009?

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 81991 and 82009 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 81991 and 82009, than apply into the LCM equation.

GCF(81991,82009) = 1
LCM(81991,82009) = ( 81991 × 82009) / 1
LCM(81991,82009) = 6723999919 / 1
LCM(81991,82009) = 6723999919

Least Common Multiple (LCM) of 81991 and 82009 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 81991 and 82009. First we will calculate the prime factors of 81991 and 82009.

Prime Factorization of 81991

Prime Factorization of 82009

Now multiplying the highest exponent prime factors to calculate the LCM of 81991 and 82009.

LCM(81991,82009) = 7¹ × 13¹ × 17¹ × 53¹ × 82009¹
LCM(81991,82009) = 6723999919