91028856 has 64 divisors (see below), whose sum is σ = 236275200. Its totient is φ = 29203200.

The previous prime is 91028831. The next prime is 91028879. The reversal of 91028856 is 65882019.

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 15 ways as a sum of consecutive naturals, for example, 77151 + ... + 78321.

It is an arithmetic number, because the mean of its divisors is an integer number (3691800).

Almost surely, 2^91028856 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 91028856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118137600).

91028856 is an abundant number, since it is smaller than the sum of its proper divisors (145246344).

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

91028856 is a wasteful number, since it uses less digits than its factorization.

91028856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1300 (or 1296 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 91028856 is about 9540.9043596506. The cubic root of 91028856 is about 449.8416825795.

The spelling of 91028856 in words is "ninety-one million, twenty-eight thousand, eight hundred fifty-six".