204128891712 has 84 divisors (see below), whose sum is σ = 587610150660. Its totient is φ = 67750889472.

The previous prime is 204128891711. The next prime is 204128891749. The reversal of 204128891712 is 217198821402.

204128891712 is a `hidden beast` number, since 2 + 0 + 412 + 88 + 91 + 71 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 50452347456 + 153676544256 = 224616^2 + 392016^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204128891711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 626287 + ... + 894702.

Almost surely, 2^204128891712 is an apocalyptic number.

It is an amenable number.

204128891712 is an abundant number, since it is smaller than the sum of its proper divisors (383481258948).

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

204128891712 is a wasteful number, since it uses less digits than its factorization.

204128891712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521240 (or 1521227 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The spelling of 204128891712 in words is "two hundred four billion, one hundred twenty-eight million, eight hundred ninety-one thousand, seven hundred twelve".