328672709 has 4 divisors (see below), whose sum is σ = 328991916. Its totient is φ = 328353504.

The previous prime is 328672661. The next prime is 328672717. The reversal of 328672709 is 907276823.

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 211557025 + 117115684 = 14545^2 + 10822^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-328672709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 328672709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328672759) 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, 158054 + ... + 160119.

It is an arithmetic number, because the mean of its divisors is an integer number (82247979).

Almost surely, 2^328672709 is an apocalyptic number.

It is an amenable number.

328672709 is a deficient number, since it is larger than the sum of its proper divisors (319207).

328672709 is a wasteful number, since it uses less digits than its factorization.

328672709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319206.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 328672709 is about 18129.3328338359. The cubic root of 328672709 is about 690.1145990431.

The spelling of 328672709 in words is "three hundred twenty-eight million, six hundred seventy-two thousand, seven hundred nine".