18019345728 has 112 divisors (see below), whose sum is σ = 49174237440. Its totient is φ = 5819111424.

The previous prime is 18019345709. The next prime is 18019345739. The reversal of 18019345728 is 82754391081.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1692550 + ... + 1703162.

Almost surely, 2^18019345728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18019345728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24587118720).

18019345728 is an abundant number, since it is smaller than the sum of its proper divisors (31154891712).

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

18019345728 is a wasteful number, since it uses less digits than its factorization.

18019345728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10904 (or 10894 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 48.

The spelling of 18019345728 in words is "eighteen billion, nineteen million, three hundred forty-five thousand, seven hundred twenty-eight".