81344164 has 48 divisors (see below), whose sum is σ = 161695296. Its totient is φ = 35481600.

The previous prime is 81344143. The next prime is 81344177. The reversal of 81344164 is 46144318.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120532 + ... + 121204.

It is an arithmetic number, because the mean of its divisors is an integer number (3368652).

Almost surely, 2^81344164 is an apocalyptic number.

It is an amenable number.

81344164 is a deficient number, since it is larger than the sum of its proper divisors (80351132).

81344164 is a wasteful number, since it uses less digits than its factorization.

81344164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796 (or 794 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 81344164 is about 9019.0999550953. The cubic root of 81344164 is about 433.2868081542.

The spelling of 81344164 in words is "eighty-one million, three hundred forty-four thousand, one hundred sixty-four".