91585140 has 72 divisors (see below), whose sum is σ = 262389792. Its totient is φ = 23868480.

The previous prime is 91585133. The next prime is 91585147. The reversal of 91585140 is 4158519.

It is an interprime number because it is at equal distance from previous prime (91585133) and next prime (91585147).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91585147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132195 + ... + 132885.

Almost surely, 2^91585140 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 91585140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131194896).

91585140 is an abundant number, since it is smaller than the sum of its proper divisors (170804652).

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

91585140 is a wasteful number, since it uses less digits than its factorization.

91585140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797 (or 748 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 33.

The square root of 91585140 is about 9570.0125391767. The cubic root of 91585140 is about 450.7561607668.

The spelling of 91585140 in words is "ninety-one million, five hundred eighty-five thousand, one hundred forty".