328612609 has 4 divisors (see below), whose sum is σ = 353890516. Its totient is φ = 303334704.

The previous prime is 328612607. The next prime is 328612643. The reversal of 328612609 is 906216823.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 906216823 = 47 ⋅19281209.

It can be written as a sum of positive squares in 2 ways, for example, as 123321025 + 205291584 = 11105^2 + 14328^2 .

It is a cyclic number.

It is not a de Polignac number, because 328612609 - 2¹ = 328612607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328612607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12638934 + ... + 12638959.

It is an arithmetic number, because the mean of its divisors is an integer number (88472629).

Almost surely, 2^328612609 is an apocalyptic number.

It is an amenable number.

328612609 is a deficient number, since it is larger than the sum of its proper divisors (25277907).

328612609 is a wasteful number, since it uses less digits than its factorization.

328612609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25277906.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 328612609 is about 18127.6752232602. The cubic root of 328612609 is about 690.0725324578.

The spelling of 328612609 in words is "three hundred twenty-eight million, six hundred twelve thousand, six hundred nine".