18549728868 has 24 divisors (see below), whose sum is σ = 47217492000. Its totient is φ = 5621129920.

The previous prime is 18549728863. The next prime is 18549728903. The reversal of 18549728868 is 86882794581.

It is a super-2 number, since 2×18549728868² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a junction number, because it is equal to n+sod(n) for n = 18549728799 and 18549728808.

It is not an unprimeable number, because it can be changed into a prime (18549728863) 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, 70263993 + ... + 70264256.

It is an arithmetic number, because the mean of its divisors is an integer number (1967395500).

Almost surely, 2^18549728868 is an apocalyptic number.

It is an amenable number.

18549728868 is an abundant number, since it is smaller than the sum of its proper divisors (28667763132).

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

18549728868 is a wasteful number, since it uses less digits than its factorization.

18549728868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140528267 (or 140528265 counting only the distinct ones).

The product of its digits is 61931520, while the sum is 66.

The spelling of 18549728868 in words is "eighteen billion, five hundred forty-nine million, seven hundred twenty-eight thousand, eight hundred sixty-eight".