328131005 has 6 divisors (see below), whose sum is σ = 393805818. Its totient is φ = 262472400.

The previous prime is 328130983. The next prime is 328131031. The reversal of 328131005 is 500131823.

It can be written as a sum of positive squares in 3 ways, for example, as 256576324 + 71554681 = 16018^2 + 8459^2 .

It is not a de Polignac number, because 328131005 - 2¹⁸ = 327868861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36455 + ... + 44555.

It is an arithmetic number, because the mean of its divisors is an integer number (65634303).

Almost surely, 2^328131005 is an apocalyptic number.

It is an amenable number.

328131005 is a deficient number, since it is larger than the sum of its proper divisors (65674813).

328131005 is an frugal number, since it uses more digits than its factorization.

328131005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16207 (or 8106 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 328131005 is about 18114.3866857258. The cubic root of 328131005 is about 689.7352516479.

Multiplying 328131005 by its product of nonzero digits (720), we get a square (236254323600 = 486060²).

Adding to 328131005 its reverse (500131823), we get a palindrome (828262828).

The spelling of 328131005 in words is "three hundred twenty-eight million, one hundred thirty-one thousand, five".