91938290 has 16 divisors (see below), whose sum is σ = 165851712. Its totient is φ = 36694704.

The previous prime is 91938263. The next prime is 91938307. The reversal of 91938290 is 9283919.

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, 5174 + ... + 14513.

It is an arithmetic number, because the mean of its divisors is an integer number (10365732).

Almost surely, 2^91938290 is an apocalyptic number.

91938290 is a deficient number, since it is larger than the sum of its proper divisors (73913422).

91938290 is a wasteful number, since it uses less digits than its factorization.

91938290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20161.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 91938290 is about 9588.4456508863. The cubic root of 91938290 is about 451.3347858272.

The spelling of 91938290 in words is "ninety-one million, nine hundred thirty-eight thousand, two hundred ninety".