91799790 has 32 divisors (see below), whose sum is σ = 227918880. Its totient is φ = 23635584.

The previous prime is 91799783. The next prime is 91799801. The reversal of 91799790 is 9799719.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51889 + ... + 53628.

It is an arithmetic number, because the mean of its divisors is an integer number (7122465).

Almost surely, 2^91799790 is an apocalyptic number.

91799790 is an abundant number, since it is smaller than the sum of its proper divisors (136119090).

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

91799790 is a wasteful number, since it uses less digits than its factorization.

91799790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105556.

The product of its (nonzero) digits is 321489, while the sum is 51.

The square root of 91799790 is about 9581.2206946714. The cubic root of 91799790 is about 451.1080348788.

The spelling of 91799790 in words is "ninety-one million, seven hundred ninety-nine thousand, seven hundred ninety".