18728023851 has 28 divisors (see below), whose sum is σ = 28092006192. Its totient is φ = 12479651856.

The previous prime is 18728023823. The next prime is 18728023889. The reversal of 18728023851 is 15832082781.

It is not a de Polignac number, because 18728023851 - 2⁵ = 18728023819 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18728023797 and 18728023806.

It is not an unprimeable number, because it can be changed into a prime (18728023801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2122090 + ... + 2130896.

Almost surely, 2^18728023851 is an apocalyptic number.

18728023851 is a deficient number, since it is larger than the sum of its proper divisors (9363982341).

18728023851 is an frugal number, since it uses more digits than its factorization.

18728023851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11742 (or 11727 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The spelling of 18728023851 in words is "eighteen billion, seven hundred twenty-eight million, twenty-three thousand, eight hundred fifty-one".