328688915 has 4 divisors (see below), whose sum is σ = 394426704. Its totient is φ = 262951128.

The previous prime is 328688911. The next prime is 328688933. The reversal of 328688915 is 519886823.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 519886823 = 10433 ⋅49831.

It is a cyclic number.

It is not a de Polignac number, because 328688915 - 2² = 328688911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328688911) 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, 32868887 + ... + 32868896.

It is an arithmetic number, because the mean of its divisors is an integer number (98606676).

Almost surely, 2^328688915 is an apocalyptic number.

328688915 is a deficient number, since it is larger than the sum of its proper divisors (65737789).

328688915 is an equidigital number, since it uses as much as digits as its factorization.

328688915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65737788.

The product of its digits is 829440, while the sum is 50.

The square root of 328688915 is about 18129.7797835495. The cubic root of 328688915 is about 690.1259414445.

The spelling of 328688915 in words is "three hundred twenty-eight million, six hundred eighty-eight thousand, nine hundred fifteen".