8731578540 has 24 divisors (see below), whose sum is σ = 24448420080. Its totient is φ = 2328420928.

The previous prime is 8731578517. The next prime is 8731578551. The reversal of 8731578540 is 458751378.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 8731578540.

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, 72763095 + ... + 72763214.

It is an arithmetic number, because the mean of its divisors is an integer number (1018684170).

Almost surely, 2^8731578540 is an apocalyptic number.

It is an amenable number.

8731578540 is an abundant number, since it is smaller than the sum of its proper divisors (15716841540).

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

8731578540 is a wasteful number, since it uses less digits than its factorization.

8731578540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145526321 (or 145526319 counting only the distinct ones).

The product of its (nonzero) digits is 940800, while the sum is 48.

The square root of 8731578540 is about 93442.9159433715. The cubic root of 8731578540 is about 2059.1955368921.

The spelling of 8731578540 in words is "eight billion, seven hundred thirty-one million, five hundred seventy-eight thousand, five hundred forty".