328433581 has 4 divisors (see below), whose sum is σ = 375352672. Its totient is φ = 281514492.

The previous prime is 328433519. The next prime is 328433617. The reversal of 328433581 is 185334823.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 328433581 - 2⁷ = 328433453 is a prime.

It is a super-2 number, since 2×328433581² = 215737234256967122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 328433581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328433681) 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 3 ways as a sum of consecutive naturals, for example, 23459535 + ... + 23459548.

It is an arithmetic number, because the mean of its divisors is an integer number (93838168).

Almost surely, 2^328433581 is an apocalyptic number.

It is an amenable number.

328433581 is a deficient number, since it is larger than the sum of its proper divisors (46919091).

328433581 is an equidigital number, since it uses as much as digits as its factorization.

328433581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46919090.

The product of its digits is 69120, while the sum is 37.

The square root of 328433581 is about 18122.7365759148. The cubic root of 328433581 is about 689.9471926260.

The spelling of 328433581 in words is "three hundred twenty-eight million, four hundred thirty-three thousand, five hundred eighty-one".