328728865 has 8 divisors (see below), whose sum is σ = 397966248. Its totient is φ = 260655360.

The previous prime is 328728863. The next prime is 328728923. The reversal of 328728865 is 568827823.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13630864 + 315098001 = 3692^2 + 17751^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 328728865 - 2¹ = 328728863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328728863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290346 + ... + 291475.

It is an arithmetic number, because the mean of its divisors is an integer number (49745781).

Almost surely, 2^328728865 is an apocalyptic number.

It is an amenable number.

328728865 is a deficient number, since it is larger than the sum of its proper divisors (69237383).

328728865 is a wasteful number, since it uses less digits than its factorization.

328728865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581939.

The product of its digits is 1290240, while the sum is 49.

The square root of 328728865 is about 18130.8815284861. The cubic root of 328728865 is about 690.1539004185.

The spelling of 328728865 in words is "three hundred twenty-eight million, seven hundred twenty-eight thousand, eight hundred sixty-five".