91911688 has 16 divisors (see below), whose sum is σ = 188001360. Its totient is φ = 41778000.

The previous prime is 91911653. The next prime is 91911691. The reversal of 91911688 is 88611919.

It is a happy 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 3 ways as a sum of consecutive naturals, for example, 522138 + ... + 522313.

It is an arithmetic number, because the mean of its divisors is an integer number (11750085).

Almost surely, 2^91911688 is an apocalyptic number.

It is an amenable number.

91911688 is an abundant number, since it is smaller than the sum of its proper divisors (96089672).

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

91911688 is a wasteful number, since it uses less digits than its factorization.

91911688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044468 (or 1044464 counting only the distinct ones).

The product of its digits is 31104, while the sum is 43.

The square root of 91911688 is about 9587.0583601019. The cubic root of 91911688 is about 451.2912509512.

The spelling of 91911688 in words is "ninety-one million, nine hundred eleven thousand, six hundred eighty-eight".