18306875728 has 40 divisors (see below), whose sum is σ = 36525835808. Its totient is φ = 8883568512.

The previous prime is 18306875707. The next prime is 18306875729. The reversal of 18306875728 is 82757860381.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18306875729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23275 + ... + 192757.

Almost surely, 2^18306875728 is an apocalyptic number.

It is an amenable number.

18306875728 is a deficient number, since it is larger than the sum of its proper divisors (18218960080).

18306875728 is a wasteful number, since it uses less digits than its factorization.

18306875728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169691 (or 169685 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 55.

The spelling of 18306875728 in words is "eighteen billion, three hundred six million, eight hundred seventy-five thousand, seven hundred twenty-eight".