18143436728 has 32 divisors (see below), whose sum is σ = 36048479760. Its totient is φ = 8531351040.

The previous prime is 18143436697. The next prime is 18143436733. The reversal of 18143436728 is 82763434181.

It is a congruent number.

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, 122498 + ... + 226478.

Almost surely, 2^18143436728 is an apocalyptic number.

It is an amenable number.

18143436728 is a deficient number, since it is larger than the sum of its proper divisors (17905043032).

18143436728 is a wasteful number, since it uses less digits than its factorization.

18143436728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105287 (or 105283 counting only the distinct ones).

The product of its digits is 774144, while the sum is 47.

The spelling of 18143436728 in words is "eighteen billion, one hundred forty-three million, four hundred thirty-six thousand, seven hundred twenty-eight".