204228239618 has 54 divisors (see below), whose sum is σ = 339577153929. Its totient is φ = 92077279632.

The previous prime is 204228239597. The next prime is 204228239693. The reversal of 204228239618 is 816932822402.

It can be written as a sum of positive squares in 2 ways, for example, as 174621187129 + 29607052489 = 417877^2 + 172067^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=319553.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 390493505 + ... + 390494027.

Almost surely, 2^204228239618 is an apocalyptic number.

204228239618 is a deficient number, since it is larger than the sum of its proper divisors (135348914311).

204228239618 is an frugal number, since it uses more digits than its factorization.

204228239618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168 (or 585 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 47.

The spelling of 204228239618 in words is "two hundred four billion, two hundred twenty-eight million, two hundred thirty-nine thousand, six hundred eighteen".