328369521 has 4 divisors (see below), whose sum is σ = 437826032. Its totient is φ = 218913012.

The previous prime is 328369499. The next prime is 328369537. The reversal of 328369521 is 125963823.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 328369521 - 2²¹ = 326272369 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 328369521.

It is not an unprimeable number, because it can be changed into a prime (328369021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54728251 + ... + 54728256.

It is an arithmetic number, because the mean of its divisors is an integer number (109456508).

Almost surely, 2^328369521 is an apocalyptic number.

It is an amenable number.

328369521 is a deficient number, since it is larger than the sum of its proper divisors (109456511).

328369521 is a wasteful number, since it uses less digits than its factorization.

328369521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109456510.

The product of its digits is 77760, while the sum is 39.

The square root of 328369521 is about 18120.9690966019. The cubic root of 328369521 is about 689.9023323218.

The spelling of 328369521 in words is "three hundred twenty-eight million, three hundred sixty-nine thousand, five hundred twenty-one".