204921612 has 144 divisors (see below), whose sum is σ = 629923840. Its totient is φ = 54867456.

The previous prime is 204921601. The next prime is 204921677. The reversal of 204921612 is 216129402.

204921612 is a `hidden beast` number, since 2 + 0 + 49 + 2 + 1 + 612 = 666.

204921612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 607908 + ... + 608244.

Almost surely, 2^204921612 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204921612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314961920).

204921612 is an abundant number, since it is smaller than the sum of its proper divisors (425002228).

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

204921612 is a wasteful number, since it uses less digits than its factorization.

204921612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500 (or 495 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 204921612 is about 14315.0833738403. The cubic root of 204921612 is about 589.5616892064.

The spelling of 204921612 in words is "two hundred four million, nine hundred twenty-one thousand, six hundred twelve".