321328625 has 16 divisors (see below), whose sum is σ = 401728080. Its totient is φ = 256608000.

The previous prime is 321328549. The next prime is 321328639. The reversal of 321328625 is 526823123.

It can be written as a sum of positive squares in 8 ways, for example, as 34093921 + 287234704 = 5839^2 + 16948^2 .

It is not a de Polignac number, because 321328625 - 2²⁰ = 320280049 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 321328591 and 321328600.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80681 + ... + 84569.

It is an arithmetic number, because the mean of its divisors is an integer number (25108005).

Almost surely, 2^321328625 is an apocalyptic number.

It is an amenable number.

321328625 is a deficient number, since it is larger than the sum of its proper divisors (80399455).

321328625 is an equidigital number, since it uses as much as digits as its factorization.

321328625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4565 (or 4555 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 321328625 is about 17925.6415505833. The cubic root of 321328625 is about 684.9357035572.

The spelling of 321328625 in words is "three hundred twenty-one million, three hundred twenty-eight thousand, six hundred twenty-five".