81976594 has 16 divisors (see below), whose sum is σ = 140678208. Its totient is φ = 35096112.

The previous prime is 81976579. The next prime is 81976603. The reversal of 81976594 is 49567918.

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 7 ways as a sum of consecutive naturals, for example, 14152 + ... + 19084.

It is an arithmetic number, because the mean of its divisors is an integer number (8792388).

Almost surely, 2^81976594 is an apocalyptic number.

81976594 is a deficient number, since it is larger than the sum of its proper divisors (58701614).

81976594 is a wasteful number, since it uses less digits than its factorization.

81976594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6129.

The product of its digits is 544320, while the sum is 49.

The square root of 81976594 is about 9054.0926657507. The cubic root of 81976594 is about 434.4068084914.

The spelling of 81976594 in words is "eighty-one million, nine hundred seventy-six thousand, five hundred ninety-four".