328720857 has 16 divisors (see below), whose sum is σ = 465315840. Its totient is φ = 205705472.

The previous prime is 328720849. The next prime is 328720871. The reversal of 328720857 is 758027823.

It is a cyclic number.

It is not a de Polignac number, because 328720857 - 2³ = 328720849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (328720837) 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 15 ways as a sum of consecutive naturals, for example, 11119 + ... + 27947.

It is an arithmetic number, because the mean of its divisors is an integer number (29082240).

Almost surely, 2^328720857 is an apocalyptic number.

It is an amenable number.

328720857 is a deficient number, since it is larger than the sum of its proper divisors (136594983).

328720857 is a wasteful number, since it uses less digits than its factorization.

328720857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17232.

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 328720857 is about 18130.6606884581. The cubic root of 328720857 is about 690.1482962079.

The spelling of 328720857 in words is "three hundred twenty-eight million, seven hundred twenty thousand, eight hundred fifty-seven".