328091 has 4 divisors (see below), whose sum is σ = 332784. Its totient is φ = 323400.

The previous prime is 328067. The next prime is 328093. The reversal of 328091 is 190823.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-328091 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 328091.

It is not an unprimeable number, because it can be changed into a prime (328093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2240 + ... + 2381.

It is an arithmetic number, because the mean of its divisors is an integer number (83196).

2³²⁸⁰⁹¹ is an apocalyptic number.

328091 is a deficient number, since it is larger than the sum of its proper divisors (4693).

328091 is an equidigital number, since it uses as much as digits as its factorization.

328091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4692.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 328091 is about 572.7922834676. The cubic root of 328091 is about 68.9707220181.

The spelling of 328091 in words is "three hundred twenty-eight thousand, ninety-one".