91582312540 has 24 divisors (see below), whose sum is σ = 197013659472. Its totient is φ = 35739438720.

The previous prime is 91582312537. The next prime is 91582312561. The reversal of 91582312540 is 4521328519.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 91582312493 and 91582312502.

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, 55842054 + ... + 55843693.

It is an arithmetic number, because the mean of its divisors is an integer number (8208902478).

Almost surely, 2^91582312540 is an apocalyptic number.

It is an amenable number.

91582312540 is an abundant number, since it is smaller than the sum of its proper divisors (105431346932).

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

91582312540 is a wasteful number, since it uses less digits than its factorization.

91582312540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111685797 (or 111685795 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 91582312540 in words is "ninety-one billion, five hundred eighty-two million, three hundred twelve thousand, five hundred forty".