328173021 has 12 divisors (see below), whose sum is σ = 517121280. Its totient is φ = 198892680.

The previous prime is 328172989. The next prime is 328173059. The reversal of 328173021 is 120371823.

It is not a de Polignac number, because 328173021 - 2⁵ = 328172989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328173221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1657341 + ... + 1657538.

It is an arithmetic number, because the mean of its divisors is an integer number (43093440).

Almost surely, 2^328173021 is an apocalyptic number.

It is an amenable number.

328173021 is a deficient number, since it is larger than the sum of its proper divisors (188948259).

328173021 is a wasteful number, since it uses less digits than its factorization.

328173021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3314896 (or 3314893 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 328173021 is about 18115.5463897725. The cubic root of 328173021 is about 689.7646897677.

The spelling of 328173021 in words is "three hundred twenty-eight million, one hundred seventy-three thousand, twenty-one".