91216928 has 48 divisors (see below), whose sum is σ = 196680960. Its totient is φ = 41299200.

The previous prime is 91216921. The next prime is 91216963. The reversal of 91216928 is 82961219.

It is a junction number, because it is equal to n+sod(n) for n = 91216891 and 91216900.

It is not an unprimeable number, because it can be changed into a prime (91216921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168338 + ... + 168878.

It is an arithmetic number, because the mean of its divisors is an integer number (4097520).

Almost surely, 2^91216928 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 91216928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98340480).

91216928 is an abundant number, since it is smaller than the sum of its proper divisors (105464032).

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

91216928 is a wasteful number, since it uses less digits than its factorization.

91216928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041 (or 1033 counting only the distinct ones).

The product of its digits is 15552, while the sum is 38.

The square root of 91216928 is about 9550.7553627972. The cubic root of 91216928 is about 450.1512709541.

The spelling of 91216928 in words is "ninety-one million, two hundred sixteen thousand, nine hundred twenty-eight".