328491 has 24 divisors (see below), whose sum is σ = 533520. Its totient is φ = 193536.

The previous prime is 328481. The next prime is 328511. The reversal of 328491 is 194823.

It is not a de Polignac number, because 328491 - 2⁹ = 327979 is a prime.

It is a d-powerful number, because it can be written as 3⁶ + 2¹⁵ + 4⁹ + 8⁵ + 9² + 1 .

328491 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (328411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2851 + ... + 2963.

It is an arithmetic number, because the mean of its divisors is an integer number (22230).

2³²⁸⁴⁹¹ is an apocalyptic number.

328491 is a deficient number, since it is larger than the sum of its proper divisors (205029).

328491 is a wasteful number, since it uses less digits than its factorization.

328491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 152 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 328491 is about 573.1413438237. The cubic root of 328491 is about 68.9987397375.

It can be divided in two parts, 3284 and 91, that added together give a cube (3375 = 15³).

The spelling of 328491 in words is "three hundred twenty-eight thousand, four hundred ninety-one".