28186539816 has 16 divisors (see below), whose sum is σ = 70466349600. Its totient is φ = 9395513264.

The previous prime is 28186539781. The next prime is 28186539827. The reversal of 28186539816 is 61893568182.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 587219556 + ... + 587219603.

It is an arithmetic number, because the mean of its divisors is an integer number (4404146850).

Almost surely, 2^28186539816 is an apocalyptic number.

It is an amenable number.

28186539816 is an abundant number, since it is smaller than the sum of its proper divisors (42279809784).

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

28186539816 is a wasteful number, since it uses less digits than its factorization.

28186539816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174439168 (or 1174439164 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 57.

The spelling of 28186539816 in words is "twenty-eight billion, one hundred eighty-six million, five hundred thirty-nine thousand, eight hundred sixteen".