328581 has 12 divisors (see below), whose sum is σ = 517920. Its totient is φ = 199080.

The previous prime is 328579. The next prime is 328589. The reversal of 328581 is 185823.

It is a happy number.

It is not a de Polignac number, because 328581 - 2¹ = 328579 is a prime.

It is a super-2 number, since 2×328581² = 215930947122, which contains 22 as substring.

328581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1561 + ... + 1758.

It is an arithmetic number, because the mean of its divisors is an integer number (43160).

2³²⁸⁵⁸¹ is an apocalyptic number.

It is an amenable number.

328581 is a deficient number, since it is larger than the sum of its proper divisors (189339).

328581 is a wasteful number, since it uses less digits than its factorization.

328581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3336 (or 3333 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 328581 is about 573.2198531105. The cubic root of 328581 is about 69.0050405895.

It can be divided in two parts, 3285 and 81, that multiplied together give a triangular number (266085 = T₇₂₉).

The spelling of 328581 in words is "three hundred twenty-eight thousand, five hundred eighty-one".