328806161 has 4 divisors (see below), whose sum is σ = 337692852. Its totient is φ = 319919472.

The previous prime is 328806113. The next prime is 328806169. The reversal of 328806161 is 161608823.

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 149915536 + 178890625 = 12244^2 + 13375^2 .

It is a cyclic number.

It is not a de Polignac number, because 328806161 - 2¹⁰ = 328805137 is a prime.

It is a super-2 number, since 2×328806161² = 216226983023115842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328806169) 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, 4443290 + ... + 4443363.

It is an arithmetic number, because the mean of its divisors is an integer number (84423213).

Almost surely, 2^328806161 is an apocalyptic number.

It is an amenable number.

328806161 is a deficient number, since it is larger than the sum of its proper divisors (8886691).

328806161 is an equidigital number, since it uses as much as digits as its factorization.

328806161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8886690.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 328806161 is about 18133.0130149405. The cubic root of 328806161 is about 690.2079895285.

The spelling of 328806161 in words is "three hundred twenty-eight million, eight hundred six thousand, one hundred sixty-one".