91864790 has 16 divisors (see below), whose sum is σ = 168875712. Its totient is φ = 35963904.

The previous prime is 91864789. The next prime is 91864807. The reversal of 91864790 is 9746819.

It is a congruent number.

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, 97259 + ... + 98198.

It is an arithmetic number, because the mean of its divisors is an integer number (10554732).

Almost surely, 2^91864790 is an apocalyptic number.

91864790 is a deficient number, since it is larger than the sum of its proper divisors (77010922).

91864790 is a wasteful number, since it uses less digits than its factorization.

91864790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195511.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 91864790 is about 9584.6121465608. The cubic root of 91864790 is about 451.2144806720.

The spelling of 91864790 in words is "ninety-one million, eight hundred sixty-four thousand, seven hundred ninety".