91085540 has 48 divisors (see below), whose sum is σ = 235425792. Its totient is φ = 28826496.

The previous prime is 91085521. The next prime is 91085551. The reversal of 91085540 is 4558019.

It is a junction number, because it is equal to n+sod(n) for n = 91085497 and 91085506.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23204 + ... + 26843.

It is an arithmetic number, because the mean of its divisors is an integer number (4904704).

Almost surely, 2^91085540 is an apocalyptic number.

It is an amenable number.

91085540 is an abundant number, since it is smaller than the sum of its proper divisors (144340252).

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

91085540 is a wasteful number, since it uses less digits than its factorization.

91085540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50076 (or 50074 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 91085540 is about 9543.8744752852. The cubic root of 91085540 is about 449.9350358894.

The spelling of 91085540 in words is "ninety-one million, eighty-five thousand, five hundred forty".