328403665 has 4 divisors (see below), whose sum is σ = 394084404. Its totient is φ = 262722928.

The previous prime is 328403653. The next prime is 328403689. The reversal of 328403665 is 566304823.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 212022721 + 116380944 = 14561^2 + 10788^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-328403665 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 32840362 + ... + 32840371.

It is an arithmetic number, because the mean of its divisors is an integer number (98521101).

Almost surely, 2^328403665 is an apocalyptic number.

It is an amenable number.

328403665 is a deficient number, since it is larger than the sum of its proper divisors (65680739).

328403665 is an equidigital number, since it uses as much as digits as its factorization.

328403665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65680738.

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 328403665 is about 18121.9111850820. The cubic root of 328403665 is about 689.9262436040.

The spelling of 328403665 in words is "three hundred twenty-eight million, four hundred three thousand, six hundred sixty-five".