328339561 has 4 divisors (see below), whose sum is σ = 358188624. Its totient is φ = 298490500.

The previous prime is 328339553. The next prime is 328339567. The reversal of 328339561 is 165933823.

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, and also an emirpimes, since its reverse is a distinct semiprime: 165933823 = 11 ⋅15084893.

It is not a de Polignac number, because 328339561 - 2³ = 328339553 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328339567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14924515 + ... + 14924536.

It is an arithmetic number, because the mean of its divisors is an integer number (89547156).

Almost surely, 2^328339561 is an apocalyptic number.

It is an amenable number.

328339561 is a deficient number, since it is larger than the sum of its proper divisors (29849063).

328339561 is a wasteful number, since it uses less digits than its factorization.

328339561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29849062.

The product of its digits is 116640, while the sum is 40.

The square root of 328339561 is about 18120.1424111402. The cubic root of 328339561 is about 689.8813497588.

It can be divided in two parts, 328 and 339561, that added together give a square (339889 = 583²).

The spelling of 328339561 in words is "three hundred twenty-eight million, three hundred thirty-nine thousand, five hundred sixty-one".