204401891868 has 96 divisors (see below), whose sum is σ = 490004992512. Its totient is φ = 66294835200.

The previous prime is 204401891839. The next prime is 204401891873. The reversal of 204401891868 is 868198104402.

It is a self number, because there is not a number n which added to its sum of digits gives 204401891868.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64054153 + ... + 64057343.

It is an arithmetic number, because the mean of its divisors is an integer number (5104218672).

Almost surely, 2^204401891868 is an apocalyptic number.

It is an amenable number.

204401891868 is an abundant number, since it is smaller than the sum of its proper divisors (285603100644).

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

204401891868 is a wasteful number, since it uses less digits than its factorization.

204401891868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4235 (or 4233 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 51.

The spelling of 204401891868 in words is "two hundred four billion, four hundred one million, eight hundred ninety-one thousand, eight hundred sixty-eight".