328686391 has 8 divisors (see below), whose sum is σ = 362888064. Its totient is φ = 295204920.

The previous prime is 328686383. The next prime is 328686433. The reversal of 328686391 is 193686823.

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

It is a cyclic number.

It is not a de Polignac number, because 328686391 - 2³ = 328686383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328686311) 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, 179091 + ... + 180916.

It is an arithmetic number, because the mean of its divisors is an integer number (45361008).

Almost surely, 2^328686391 is an apocalyptic number.

328686391 is a deficient number, since it is larger than the sum of its proper divisors (34201673).

328686391 is a wasteful number, since it uses less digits than its factorization.

328686391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360101.

The product of its digits is 373248, while the sum is 46.

The square root of 328686391 is about 18129.7101741865. The cubic root of 328686391 is about 690.1241749492.

The spelling of 328686391 in words is "three hundred twenty-eight million, six hundred eighty-six thousand, three hundred ninety-one".