328091009 has 4 divisors (see below), whose sum is σ = 328250304. Its totient is φ = 327931716.

The previous prime is 328090969. The next prime is 328091017. The reversal of 328091009 is 900190823.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 328091009 - 2⁸ = 328090753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328091059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76517 + ... + 80690.

It is an arithmetic number, because the mean of its divisors is an integer number (82062576).

Almost surely, 2^328091009 is an apocalyptic number.

It is an amenable number.

328091009 is a deficient number, since it is larger than the sum of its proper divisors (159295).

328091009 is a wasteful number, since it uses less digits than its factorization.

328091009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159294.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 328091009 is about 18113.2826677000. The cubic root of 328091009 is about 689.7072264876.

The spelling of 328091009 in words is "three hundred twenty-eight million, ninety-one thousand, nine".