91489864 has 32 divisors (see below), whose sum is σ = 182628000. Its totient is φ = 42844032.

The previous prime is 91489847. The next prime is 91489873. The reversal of 91489864 is 46898419.

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, 10147 + ... + 16909.

It is an arithmetic number, because the mean of its divisors is an integer number (5707125).

Almost surely, 2^91489864 is an apocalyptic number.

It is an amenable number.

91489864 is a deficient number, since it is larger than the sum of its proper divisors (91138136).

91489864 is a wasteful number, since it uses less digits than its factorization.

91489864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6877 (or 6873 counting only the distinct ones).

The product of its digits is 497664, while the sum is 49.

The square root of 91489864 is about 9565.0334029736. The cubic root of 91489864 is about 450.5997993567.

The spelling of 91489864 in words is "ninety-one million, four hundred eighty-nine thousand, eight hundred sixty-four".