91868928 has 144 divisors (see below), whose sum is σ = 260045856. Its totient is φ = 28753920.

The previous prime is 91868927. The next prime is 91868929. The reversal of 91868928 is 82986819.

It is an interprime number because it is at equal distance from previous prime (91868927) and next prime (91868929).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91868921) 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 15 ways as a sum of consecutive naturals, for example, 1506018 + ... + 1506078.

It is an arithmetic number, because the mean of its divisors is an integer number (1805874).

Almost surely, 2^91868928 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 91868928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130022928).

91868928 is an abundant number, since it is smaller than the sum of its proper divisors (168176928).

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

91868928 is a wasteful number, since it uses less digits than its factorization.

91868928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170 (or 156 counting only the distinct ones).

The product of its digits is 497664, while the sum is 51.

The square root of 91868928 is about 9584.8280109765. The cubic root of 91868928 is about 451.2212554747.

The spelling of 91868928 in words is "ninety-one million, eight hundred sixty-eight thousand, nine hundred twenty-eight".