91689584 has 60 divisors (see below), whose sum is σ = 208774584. Its totient is φ = 38892672.

The previous prime is 91689583. The next prime is 91689623. The reversal of 91689584 is 48598619.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91689583) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 83342 + ... + 84434.

Almost surely, 2^91689584 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 91689584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104387292).

91689584 is an abundant number, since it is smaller than the sum of its proper divisors (117085000).

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

91689584 is a wasteful number, since it uses less digits than its factorization.

91689584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222 (or 1209 counting only the distinct ones).

The product of its digits is 622080, while the sum is 50.

The square root of 91689584 is about 9575.4678214696. The cubic root of 91689584 is about 450.9274436173.

The spelling of 91689584 in words is "ninety-one million, six hundred eighty-nine thousand, five hundred eighty-four".