18304252638 has 16 divisors (see below), whose sum is σ = 41838291840. Its totient is φ = 5229786456.

The previous prime is 18304252627. The next prime is 18304252639. The reversal of 18304252638 is 83625240381.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 435815539 = 18304252638 / (1 + 8 + 3 + 0 + 4 + 2 + 5 + 2 + 6 + 3 + 8).

It is a self number, because there is not a number n which added to its sum of digits gives 18304252638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18304252639) 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, 217907728 + ... + 217907811.

It is an arithmetic number, because the mean of its divisors is an integer number (2614893240).

Almost surely, 2^18304252638 is an apocalyptic number.

18304252638 is an abundant number, since it is smaller than the sum of its proper divisors (23534039202).

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

18304252638 is a wasteful number, since it uses less digits than its factorization.

18304252638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435815551.

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 18304252638 in words is "eighteen billion, three hundred four million, two hundred fifty-two thousand, six hundred thirty-eight".