91285568 has 56 divisors (see below), whose sum is σ = 199363584. Its totient is φ = 41126400.

The previous prime is 91285541. The next prime is 91285573. The reversal of 91285568 is 86558219.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88898 + ... + 89918.

It is an arithmetic number, because the mean of its divisors is an integer number (3560064).

Almost surely, 2^91285568 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 91285568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99681792).

91285568 is an abundant number, since it is smaller than the sum of its proper divisors (108078016).

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

91285568 is a wasteful number, since it uses less digits than its factorization.

91285568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171 (or 1161 counting only the distinct ones).

The product of its digits is 172800, while the sum is 44.

The square root of 91285568 is about 9554.3481200969. The cubic root of 91285568 is about 450.2641543735.

The spelling of 91285568 in words is "ninety-one million, two hundred eighty-five thousand, five hundred sixty-eight".