181218346728 has 32 divisors (see below), whose sum is σ = 453097860000. Its totient is φ = 60399183168.

The previous prime is 181218346723. The next prime is 181218346739. The reversal of 181218346728 is 827643812181.

It is a happy number.

181218346728 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (181218346723) 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, 217603 + ... + 640146.

It is an arithmetic number, because the mean of its divisors is an integer number (14159308125).

Almost surely, 2^181218346728 is an apocalyptic number.

It is an amenable number.

181218346728 is an abundant number, since it is smaller than the sum of its proper divisors (271879513272).

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

181218346728 is a wasteful number, since it uses less digits than its factorization.

181218346728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866561 (or 866557 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 51.

The spelling of 181218346728 in words is "one hundred eighty-one billion, two hundred eighteen million, three hundred forty-six thousand, seven hundred twenty-eight".