206305728 has 28 divisors (see below), whose sum is σ = 545851080. Its totient is φ = 68768512.

The previous prime is 206305709. The next prime is 206305741. The reversal of 206305728 is 827503602.

206305728 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 537063 + ... + 537446.

Almost surely, 2^206305728 is an apocalyptic number.

It is an amenable number.

206305728 is an abundant number, since it is smaller than the sum of its proper divisors (339545352).

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

206305728 is a wasteful number, since it uses less digits than its factorization.

206305728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074524 (or 1074514 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 206305728 is about 14363.3466852263. The cubic root of 206305728 is about 590.8860840732.

The spelling of 206305728 in words is "two hundred six million, three hundred five thousand, seven hundred twenty-eight".