328381687 has 4 divisors (see below), whose sum is σ = 328425160. Its totient is φ = 328338216.

The previous prime is 328381681. The next prime is 328381721. The reversal of 328381687 is 786183823.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 786183823 = 29 ⋅27109787.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-328381687 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 (328381681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7137 + ... + 26602.

It is an arithmetic number, because the mean of its divisors is an integer number (82106290).

Almost surely, 2^328381687 is an apocalyptic number.

328381687 is a deficient number, since it is larger than the sum of its proper divisors (43473).

328381687 is an equidigital number, since it uses as much as digits as its factorization.

328381687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43472.

The product of its digits is 387072, while the sum is 46.

The square root of 328381687 is about 18121.3047819411. The cubic root of 328381687 is about 689.9108524468.

The spelling of 328381687 in words is "three hundred twenty-eight million, three hundred eighty-one thousand, six hundred eighty-seven".