18923028728 has 32 divisors (see below), whose sum is σ = 36810082800. Its totient is φ = 9108890112.

The previous prime is 18923028727. The next prime is 18923028743. The reversal of 18923028728 is 82782032981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18923028727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37025 + ... + 198032.

Almost surely, 2^18923028728 is an apocalyptic number.

It is an amenable number.

18923028728 is a deficient number, since it is larger than the sum of its proper divisors (17887054072).

18923028728 is a wasteful number, since it uses less digits than its factorization.

18923028728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235439 (or 235435 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 50.

The spelling of 18923028728 in words is "eighteen billion, nine hundred twenty-three million, twenty-eight thousand, seven hundred twenty-eight".