91812904 has 16 divisors (see below), whose sum is σ = 172307520. Its totient is φ = 45864240.

The previous prime is 91812881. The next prime is 91812953. The reversal of 91812904 is 40921819.

It is a self number, because there is not a number n which added to its sum of digits gives 91812904.

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 3 ways as a sum of consecutive naturals, for example, 5187 + ... + 14509.

It is an arithmetic number, because the mean of its divisors is an integer number (10769220).

Almost surely, 2^91812904 is an apocalyptic number.

It is an amenable number.

91812904 is a deficient number, since it is larger than the sum of its proper divisors (80494616).

91812904 is a wasteful number, since it uses less digits than its factorization.

91812904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10560 (or 10556 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 91812904 is about 9581.9050297944. The cubic root of 91812904 is about 451.1295147721.

The spelling of 91812904 in words is "ninety-one million, eight hundred twelve thousand, nine hundred four".