328681 has 4 divisors (see below), whose sum is σ = 346000. Its totient is φ = 311364.

The previous prime is 328667. The next prime is 328687. The reversal of 328681 is 186823.

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 a cyclic number.

It is not a de Polignac number, because 328681 - 2¹¹ = 326633 is a prime.

It is a super-2 number, since 2×328681² = 216062399522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328687) 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, 8631 + ... + 8668.

It is an arithmetic number, because the mean of its divisors is an integer number (86500).

2³²⁸⁶⁸¹ is an apocalyptic number.

It is an amenable number.

328681 is a deficient number, since it is larger than the sum of its proper divisors (17319).

328681 is a wasteful number, since it uses less digits than its factorization.

328681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17318.

The product of its digits is 2304, while the sum is 28.

The square root of 328681 is about 573.3070730420. The cubic root of 328681 is about 69.0120401870.

The spelling of 328681 in words is "three hundred twenty-eight thousand, six hundred eighty-one".