328 has 8 divisors (see below), whose sum is σ = 630. Its totient is φ = 160.

The previous prime is 317. The next prime is 331. The reversal of 328 is 823.

328 is nontrivially palindromic in base 3, base 7 and base 9.

328 is an esthetic number in base 12, because in such base it adjacent digits differ by 1.

It can be written as a sum of positive squares in only one way, i.e., 324 + 4 = 18^2 + 2^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a Sastry number since concatenated with its successor gives a square.

328 is an undulating number in base 7 and base 9.

It is a plaindrome in base 11, base 12, base 15 and base 16.

It is a nialpdrome in base 8.

It is a zygodrome in base 3.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13 + ... + 28.

It is an amenable number.

328 is a deficient number, since it is larger than the sum of its proper divisors (302).

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

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

The sum of its prime factors is 47 (or 43 counting only the distinct ones).

The product of its digits is 48, while the sum is 13.

The square root of 328 is about 18.1107702763. The cubic root of 328 is about 6.8964344808.

The spelling of 328 in words is "three hundred twenty-eight", and is thus an aban number and an oban number.

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