328731 has 8 divisors (see below), whose sum is σ = 472080. Its totient is φ = 202272.

The previous prime is 328721. The next prime is 328753. The reversal of 328731 is 137823.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 328731 - 2⁶ = 328667 is a prime.

It is a super-2 number, since 2×328731² = 216128140722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (328721) 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 7 ways as a sum of consecutive naturals, for example, 4176 + ... + 4253.

It is an arithmetic number, because the mean of its divisors is an integer number (59010).

2³²⁸⁷³¹ is an apocalyptic number.

328731 is a deficient number, since it is larger than the sum of its proper divisors (143349).

328731 is a wasteful number, since it uses less digits than its factorization.

328731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8445.

The product of its digits is 1008, while the sum is 24.

The square root of 328731 is about 573.3506780322. The cubic root of 328731 is about 69.0155394533.

Subtracting from 328731 its product of digits (1008), we obtain a palindrome (327723).

The spelling of 328731 in words is "three hundred twenty-eight thousand, seven hundred thirty-one".