91515968 has 56 divisors (see below), whose sum is σ = 189219840. Its totient is φ = 43868160.

The previous prime is 91515961. The next prime is 91515971. The reversal of 91515968 is 86951519.

It is not an unprimeable number, because it can be changed into a prime (91515961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 382793 + ... + 383031.

Almost surely, 2^91515968 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 91515968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94609920).

91515968 is an abundant number, since it is smaller than the sum of its proper divisors (97703872).

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

91515968 is a wasteful number, since it uses less digits than its factorization.

91515968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475 (or 465 counting only the distinct ones).

The product of its digits is 97200, while the sum is 44.

The square root of 91515968 is about 9566.3978591735. The cubic root of 91515968 is about 450.6426505103.

The spelling of 91515968 in words is "ninety-one million, five hundred fifteen thousand, nine hundred sixty-eight".