328286781 has 12 divisors (see below), whose sum is σ = 474920160. Its totient is φ = 218521800.

The previous prime is 328286753. The next prime is 328286821. The reversal of 328286781 is 187682823.

It is not a de Polignac number, because 328286781 - 2⁷ = 328286653 is a prime.

It is a super-2 number, since 2×328286781² = 215544421158683922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328286701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21745 + ... + 33606.

It is an arithmetic number, because the mean of its divisors is an integer number (39576680).

Almost surely, 2^328286781 is an apocalyptic number.

It is an amenable number.

328286781 is a deficient number, since it is larger than the sum of its proper divisors (146633379).

328286781 is a wasteful number, since it uses less digits than its factorization.

328286781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56016 (or 56013 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 328286781 is about 18118.6859622877. The cubic root of 328286781 is about 689.8443820449.

The spelling of 328286781 in words is "three hundred twenty-eight million, two hundred eighty-six thousand, seven hundred eighty-one".