91814928 has 80 divisors (see below), whose sum is σ = 249091200. Its totient is φ = 29102080.

The previous prime is 91814911. The next prime is 91814939. The reversal of 91814928 is 82941819.

It is a self number, because there is not a number n which added to its sum of digits gives 91814928.

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 15 ways as a sum of consecutive naturals, for example, 98368 + ... + 99296.

It is an arithmetic number, because the mean of its divisors is an integer number (3113640).

Almost surely, 2^91814928 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 91814928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124545600).

91814928 is an abundant number, since it is smaller than the sum of its proper divisors (157276272).

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

91814928 is a wasteful number, since it uses less digits than its factorization.

91814928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040 (or 1034 counting only the distinct ones).

The product of its digits is 41472, while the sum is 42.

The square root of 91814928 is about 9582.0106449534. The cubic root of 91814928 is about 451.1328297725.

The spelling of 91814928 in words is "ninety-one million, eight hundred fourteen thousand, nine hundred twenty-eight".