328540109 has 4 divisors (see below), whose sum is σ = 328583100. Its totient is φ = 328497120.

The previous prime is 328540097. The next prime is 328540123. The reversal of 328540109 is 901045823.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 386884 + 328153225 = 622^2 + 18115^2 .

It is a cyclic number.

It is not a de Polignac number, because 328540109 - 2⁸ = 328539853 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328540169) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6584 + ... + 26465.

It is an arithmetic number, because the mean of its divisors is an integer number (82145775).

Almost surely, 2^328540109 is an apocalyptic number.

It is an amenable number.

328540109 is a deficient number, since it is larger than the sum of its proper divisors (42991).

328540109 is an equidigital number, since it uses as much as digits as its factorization.

328540109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42990.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 328540109 is about 18125.6754081055. The cubic root of 328540109 is about 690.0217797508.

The spelling of 328540109 in words is "three hundred twenty-eight million, five hundred forty thousand, one hundred nine".