91885240 has 32 divisors (see below), whose sum is σ = 213413760. Its totient is φ = 35568000.

The previous prime is 91885229. The next prime is 91885259. The reversal of 91885240 is 4258819.

It is a self number, because there is not a number n which added to its sum of digits gives 91885240.

It is a congruent number.

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, 35811 + ... + 38290.

It is an arithmetic number, because the mean of its divisors is an integer number (6669180).

Almost surely, 2^91885240 is an apocalyptic number.

It is an amenable number.

91885240 is an abundant number, since it is smaller than the sum of its proper divisors (121528520).

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

91885240 is a wasteful number, since it uses less digits than its factorization.

91885240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74143 (or 74139 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 91885240 is about 9585.6789013611. The cubic root of 91885240 is about 451.2479597721.

The spelling of 91885240 in words is "ninety-one million, eight hundred eighty-five thousand, two hundred forty".