91163928 has 32 divisors (see below), whose sum is σ = 241317360. Its totient is φ = 28600320.

The previous prime is 91163923. The next prime is 91163959. The reversal of 91163928 is 82936119.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91163923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111313 + ... + 112128.

Almost surely, 2^91163928 is an apocalyptic number.

It is an amenable number.

91163928 is an abundant number, since it is smaller than the sum of its proper divisors (150153432).

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

91163928 is a wasteful number, since it uses less digits than its factorization.

91163928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223467 (or 223463 counting only the distinct ones).

The product of its digits is 23328, while the sum is 39.

The square root of 91163928 is about 9547.9803099923. The cubic root of 91163928 is about 450.0640698898.

The spelling of 91163928 in words is "ninety-one million, one hundred sixty-three thousand, nine hundred twenty-eight".