3205561728 has 32 divisors (see below), whose sum is σ = 8514774360. Its totient is φ = 1068520448.

The previous prime is 3205561699. The next prime is 3205561783. The reversal of 3205561728 is 8271655023.

3205561728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (32).

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, 4173525 + ... + 4174292.

Almost surely, 2^3205561728 is an apocalyptic number.

It is an amenable number.

3205561728 is an abundant number, since it is smaller than the sum of its proper divisors (5309212632).

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

3205561728 is an equidigital number, since it uses as much as digits as its factorization.

3205561728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8347834 (or 8347822 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 3205561728 is about 56617.6803481033. The cubic root of 3205561728 is about 1474.4658378735.

The spelling of 3205561728 in words is "three billion, two hundred five million, five hundred sixty-one thousand, seven hundred twenty-eight".