91539040 has 96 divisors (see below), whose sum is σ = 224423136. Its totient is φ = 35266560.

The previous prime is 91539023. The next prime is 91539059. The reversal of 91539040 is 4093519.

It is a junction number, because it is equal to n+sod(n) for n = 91538993 and 91539011.

It is a congruent number.

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, 810024 + ... + 810136.

It is an arithmetic number, because the mean of its divisors is an integer number (2337741).

Almost surely, 2^91539040 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 91539040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112211568).

91539040 is an abundant number, since it is smaller than the sum of its proper divisors (132884096).

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

91539040 is a wasteful number, since it uses less digits than its factorization.

91539040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 91539040 is about 9567.6036707213. The cubic root of 91539040 is about 450.6805176856.

The spelling of 91539040 in words is "ninety-one million, five hundred thirty-nine thousand, forty".