328790381 has 4 divisors (see below), whose sum is σ = 328881564. Its totient is φ = 328699200.

The previous prime is 328790377. The next prime is 328790389. The reversal of 328790381 is 183097823.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 199967881 + 128822500 = 14141^2 + 11350^2 .

It is a cyclic number.

It is not a de Polignac number, because 328790381 - 2² = 328790377 is a prime.

It is a super-2 number, since 2×328790381² = 216206229276250322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328790389) 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, 39950 + ... + 47471.

It is an arithmetic number, because the mean of its divisors is an integer number (82220391).

Almost surely, 2^328790381 is an apocalyptic number.

It is an amenable number.

328790381 is a deficient number, since it is larger than the sum of its proper divisors (91183).

328790381 is an equidigital number, since it uses as much as digits as its factorization.

328790381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91182.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 328790381 is about 18132.5778917395. The cubic root of 328790381 is about 690.1969479102.

The spelling of 328790381 in words is "three hundred twenty-eight million, seven hundred ninety thousand, three hundred eighty-one".