8539899816 has 256 divisors, whose sum is σ = 27894067200. Its totient is φ = 2120380416.

The previous prime is 8539899791. The next prime is 8539899821. The reversal of 8539899816 is 6189989358.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1902711 + ... + 1907193.

It is an arithmetic number, because the mean of its divisors is an integer number (108961200).

Almost surely, 2^8539899816 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 8539899816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13947033600).

8539899816 is an abundant number, since it is smaller than the sum of its proper divisors (19354167384).

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

8539899816 is a wasteful number, since it uses less digits than its factorization.

8539899816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4568 (or 4564 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 66.

The square root of 8539899816 is about 92411.5783654841. The cubic root of 8539899816 is about 2044.0158475748.

The spelling of 8539899816 in words is "eight billion, five hundred thirty-nine million, eight hundred ninety-nine thousand, eight hundred sixteen".