What is the Least Common Multiple of 81781 and 81791?

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 81781 and 81791 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 81781 and 81791, than apply into the LCM equation.

GCF(81781,81791) = 1
LCM(81781,81791) = ( 81781 × 81791) / 1
LCM(81781,81791) = 6688949771 / 1
LCM(81781,81791) = 6688949771

Least Common Multiple (LCM) of 81781 and 81791 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 81781 and 81791. First we will calculate the prime factors of 81781 and 81791.

Prime Factorization of 81781

Prime Factorization of 81791

Now multiplying the highest exponent prime factors to calculate the LCM of 81781 and 81791.

LCM(81781,81791) = 7² × 1669¹ × 89¹ × 919¹
LCM(81781,81791) = 6688949771