328720281 has 8 divisors (see below), whose sum is σ = 439961280. Its totient is φ = 218313072.

The previous prime is 328720267. The next prime is 328720331. The reversal of 328720281 is 182027823.

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

It is not a de Polignac number, because 328720281 - 2⁷ = 328720153 is a prime.

It is a super-2 number, since 2×328720281² = 216114046281437922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (328720781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207526 + ... + 209103.

It is an arithmetic number, because the mean of its divisors is an integer number (54995160).

Almost surely, 2^328720281 is an apocalyptic number.

It is an amenable number.

328720281 is a deficient number, since it is larger than the sum of its proper divisors (111240999).

328720281 is a wasteful number, since it uses less digits than its factorization.

328720281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416895.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 328720281 is about 18130.6448037570. The cubic root of 328720281 is about 690.1478931044.

The spelling of 328720281 in words is "three hundred twenty-eight million, seven hundred twenty thousand, two hundred eighty-one".