91196988928 has 40 divisors (see below), whose sum is σ = 182441369880. Its totient is φ = 45542062080.

The previous prime is 91196988863. The next prime is 91196988947. The reversal of 91196988928 is 82988969119.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305418 + ... + 525046.

It is an arithmetic number, because the mean of its divisors is an integer number (4561034247).

Almost surely, 2^91196988928 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 91196988928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91220684940).

91196988928 is an abundant number, since it is smaller than the sum of its proper divisors (91244380952).

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

91196988928 is an equidigital number, since it uses as much as digits as its factorization.

91196988928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220458 (or 220442 counting only the distinct ones).

The product of its digits is 40310784, while the sum is 70.

The spelling of 91196988928 in words is "ninety-one billion, one hundred ninety-six million, nine hundred eighty-eight thousand, nine hundred twenty-eight".