200643904 has 56 divisors (see below), whose sum is σ = 428963328. Its totient is φ = 92843520.

The previous prime is 200643851. The next prime is 200643917. The reversal of 200643904 is 409346002.

200643904 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×200643904² = 80515952424722432, which contains 22 as substring.

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, 43434 + ... + 47830.

Almost surely, 2^200643904 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 200643904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214481664).

200643904 is an abundant number, since it is smaller than the sum of its proper divisors (228319424).

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

200643904 is a wasteful number, since it uses less digits than its factorization.

200643904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4463 (or 4453 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 200643904 is about 14164.8827739590. The cubic root of 200643904 is about 585.4304708984.

Adding to 200643904 its reverse (409346002), we get a palindrome (609989906).

The spelling of 200643904 in words is "two hundred million, six hundred forty-three thousand, nine hundred four".