328687999 has 4 divisors (see below), whose sum is σ = 330356664. Its totient is φ = 327019336.

The previous prime is 328687987. The next prime is 328688023. The reversal of 328687999 is 999786823.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 328687999 - 2⁹ = 328687487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328681999) 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, 834037 + ... + 834430.

It is an arithmetic number, because the mean of its divisors is an integer number (82589166).

Almost surely, 2^328687999 is an apocalyptic number.

328687999 is a deficient number, since it is larger than the sum of its proper divisors (1668665).

328687999 is a wasteful number, since it uses less digits than its factorization.

328687999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668664.

The product of its digits is 11757312, while the sum is 61.

The square root of 328687999 is about 18129.7545212284. The cubic root of 328687999 is about 690.1253003561.

The spelling of 328687999 in words is "three hundred twenty-eight million, six hundred eighty-seven thousand, nine hundred ninety-nine".