91608564 has 48 divisors (see below), whose sum is σ = 224481600. Its totient is φ = 29035776.

The previous prime is 91608523. The next prime is 91608577. The reversal of 91608564 is 46580619.

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, 21352 + ... + 25280.

It is an arithmetic number, because the mean of its divisors is an integer number (4676700).

Almost surely, 2^91608564 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 91608564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112240800).

91608564 is an abundant number, since it is smaller than the sum of its proper divisors (132873036).

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

91608564 is a wasteful number, since it uses less digits than its factorization.

91608564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4032 (or 4030 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 91608564 is about 9571.2362837828. The cubic root of 91608564 is about 450.7945862592.

The spelling of 91608564 in words is "ninety-one million, six hundred eight thousand, five hundred sixty-four".