81344918 has 8 divisors (see below), whose sum is σ = 122124240. Its totient is φ = 40636840.

The previous prime is 81344891. The next prime is 81344927. The reversal of 81344918 is 81944318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14858 + ... + 19581.

It is an arithmetic number, because the mean of its divisors is an integer number (15265530).

Almost surely, 2^81344918 is an apocalyptic number.

81344918 is a deficient number, since it is larger than the sum of its proper divisors (40779322).

81344918 is a wasteful number, since it uses less digits than its factorization.

81344918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35622.

The product of its digits is 27648, while the sum is 38.

The square root of 81344918 is about 9019.1417551783. The cubic root of 81344918 is about 433.2881468991.

The spelling of 81344918 in words is "eighty-one million, three hundred forty-four thousand, nine hundred eighteen".