91039128 has 32 divisors (see below), whose sum is σ = 229618800. Its totient is φ = 30076928.

The previous prime is 91039099. The next prime is 91039153. The reversal of 91039128 is 82193019.

It is a congruent number.

It is an unprimeable number.

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, 14073 + ... + 19496.

Almost surely, 2^91039128 is an apocalyptic number.

It is an amenable number.

91039128 is an abundant number, since it is smaller than the sum of its proper divisors (138579672).

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

91039128 is a wasteful number, since it uses less digits than its factorization.

91039128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33691 (or 33687 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 91039128 is about 9541.4426582147. The cubic root of 91039128 is about 449.8586024888.

The spelling of 91039128 in words is "ninety-one million, thirty-nine thousand, one hundred twenty-eight".