328185881 has 4 divisors (see below), whose sum is σ = 332681652. Its totient is φ = 323690112.

The previous prime is 328185863. The next prime is 328185883. The reversal of 328185881 is 188581823.

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 177289225 + 150896656 = 13315^2 + 12284^2 .

It is a cyclic number.

It is not a de Polignac number, because 328185881 - 2⁶ = 328185817 is a prime.

It is a super-2 number, since 2×328185881² = 215411944975492322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328185883) 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, 2247776 + ... + 2247921.

It is an arithmetic number, because the mean of its divisors is an integer number (83170413).

Almost surely, 2^328185881 is an apocalyptic number.

It is an amenable number.

328185881 is a deficient number, since it is larger than the sum of its proper divisors (4495771).

328185881 is an equidigital number, since it uses as much as digits as its factorization.

328185881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4495770.

The product of its digits is 122880, while the sum is 44.

The square root of 328185881 is about 18115.9013300470. The cubic root of 328185881 is about 689.7736995050.

The spelling of 328185881 in words is "three hundred twenty-eight million, one hundred eighty-five thousand, eight hundred eighty-one".