81087592 has 32 divisors (see below), whose sum is σ = 160617600. Its totient is φ = 38271744.

The previous prime is 81087563. The next prime is 81087619. The reversal of 81087592 is 29578018.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50433 + ... + 52015.

It is an arithmetic number, because the mean of its divisors is an integer number (5019300).

Almost surely, 2^81087592 is an apocalyptic number.

It is an amenable number.

81087592 is a deficient number, since it is larger than the sum of its proper divisors (79530008).

81087592 is a wasteful number, since it uses less digits than its factorization.

81087592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1945 (or 1941 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 81087592 is about 9004.8649073709. The cubic root of 81087592 is about 432.8307772834.

The spelling of 81087592 in words is "eighty-one million, eighty-seven thousand, five hundred ninety-two".