91817868 has 48 divisors (see below), whose sum is σ = 221243904. Its totient is φ = 29615040.

The previous prime is 91817851. The next prime is 91817881. The reversal of 91817868 is 86871819.

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, 100333 + ... + 101243.

It is an arithmetic number, because the mean of its divisors is an integer number (4609248).

Almost surely, 2^91817868 is an apocalyptic number.

It is an amenable number.

91817868 is an abundant number, since it is smaller than the sum of its proper divisors (129426036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91817868 is a wasteful number, since it uses less digits than its factorization.

91817868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182 (or 1180 counting only the distinct ones).

The product of its digits is 193536, while the sum is 48.

The square root of 91817868 is about 9582.1640562036. The cubic root of 91817868 is about 451.1376449530.

The spelling of 91817868 in words is "ninety-one million, eight hundred seventeen thousand, eight hundred sixty-eight".