328681187 has 4 divisors (see below), whose sum is σ = 330697800. Its totient is φ = 326664576.

The previous prime is 328681139. The next prime is 328681211. The reversal of 328681187 is 781186823.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 781186823 = 101 ⋅7734523.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-328681187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328621187) 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, 1008062 + ... + 1008387.

It is an arithmetic number, because the mean of its divisors is an integer number (82674450).

Almost surely, 2^328681187 is an apocalyptic number.

328681187 is a deficient number, since it is larger than the sum of its proper divisors (2016613).

328681187 is a wasteful number, since it uses less digits than its factorization.

328681187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2016612.

The product of its digits is 129024, while the sum is 44.

The square root of 328681187 is about 18129.5666522948. The cubic root of 328681187 is about 690.1205327487.

The spelling of 328681187 in words is "three hundred twenty-eight million, six hundred eighty-one thousand, one hundred eighty-seven".