181818025728 has 72 divisors (see below), whose sum is σ = 512365907088. Its totient is φ = 57040945152.

The previous prime is 181818025703. The next prime is 181818025853. The reversal of 181818025728 is 827520818181.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6949951 + ... + 6976062.

It is an arithmetic number, because the mean of its divisors is an integer number (7116193154).

Almost surely, 2^181818025728 is an apocalyptic number.

It is an amenable number.

181818025728 is an abundant number, since it is smaller than the sum of its proper divisors (330547881360).

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

181818025728 is a wasteful number, since it uses less digits than its factorization.

181818025728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13926049 (or 13926035 counting only the distinct ones).

The product of its (nonzero) digits is 573440, while the sum is 51.

The spelling of 181818025728 in words is "one hundred eighty-one billion, eight hundred eighteen million, twenty-five thousand, seven hundred twenty-eight".