91330928 has 40 divisors (see below), whose sum is σ = 191560656. Its totient is φ = 41932800.

The previous prime is 91330909. The next prime is 91330931. The reversal of 91330928 is 82903319.

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, 42848 + ... + 44928.

Almost surely, 2^91330928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91330928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95780328).

91330928 is an abundant number, since it is smaller than the sum of its proper divisors (100229728).

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

91330928 is a wasteful number, since it uses less digits than its factorization.

91330928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2313 (or 2307 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 91330928 is about 9556.7216136079. The cubic root of 91330928 is about 450.3387211077.

The spelling of 91330928 in words is "ninety-one million, three hundred thirty thousand, nine hundred twenty-eight".