91168228 has 24 divisors (see below), whose sum is σ = 172226880. Its totient is φ = 42097440.

The previous prime is 91168211. The next prime is 91168243. The reversal of 91168228 is 82286119.

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, 14418 + ... + 19753.

It is an arithmetic number, because the mean of its divisors is an integer number (7176120).

Almost surely, 2^91168228 is an apocalyptic number.

It is an amenable number.

91168228 is a deficient number, since it is larger than the sum of its proper divisors (81058652).

91168228 is a wasteful number, since it uses less digits than its factorization.

91168228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34227 (or 34225 counting only the distinct ones).

The product of its digits is 13824, while the sum is 37.

The square root of 91168228 is about 9548.2054858492. The cubic root of 91168228 is about 450.0711459527.

The spelling of 91168228 in words is "ninety-one million, one hundred sixty-eight thousand, two hundred twenty-eight".