328569561 has 16 divisors (see below), whose sum is σ = 488923200. Its totient is φ = 218077344.

The previous prime is 328569551. The next prime is 328569653. The reversal of 328569561 is 165965823.

328569561 is a `hidden beast` number, since 3 + 2 + 85 + 6 + 9 + 561 = 666.

It is not a de Polignac number, because 328569561 - 2¹⁴ = 328553177 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (328569551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20676 + ... + 32933.

It is an arithmetic number, because the mean of its divisors is an integer number (30557700).

Almost surely, 2^328569561 is an apocalyptic number.

It is an amenable number.

328569561 is a deficient number, since it is larger than the sum of its proper divisors (160353639).

328569561 is a wasteful number, since it uses less digits than its factorization.

328569561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53845 (or 53839 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The square root of 328569561 is about 18126.4878285894. The cubic root of 328569561 is about 690.0423981509.

The spelling of 328569561 in words is "three hundred twenty-eight million, five hundred sixty-nine thousand, five hundred sixty-one".