328805689 has 3 divisors (see below), whose sum is σ = 328823823. Its totient is φ = 328787556.

The previous prime is 328805669. The next prime is 328805707. The reversal of 328805689 is 986508823.

The square root of 328805689 is 18133.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 135373225 + 193432464 = 11635^2 + 13908^2 .

It is not a de Polignac number, because 328805689 - 2⁵ = 328805657 is a prime.

It is a super-2 number, since 2×328805689² = 216226362237529442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328805669) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 9067 + ... + 27199.

It is an arithmetic number, because the mean of its divisors is an integer number (109607941).

Almost surely, 2^328805689 is an apocalyptic number.

328805689 is the 18133-rd square number.

328805689 is the 9067-th centered octagonal number.

It is an amenable number.

328805689 is a deficient number, since it is larger than the sum of its proper divisors (18134).

328805689 is an frugal number, since it uses more digits than its factorization.

328805689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36266 (or 18133 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 49.

The cubic root of 328805689 is about 690.2076592647.

Multiplying 328805689 by its sum of digits (49), we get a square (16111478761 = 126931²).

The spelling of 328805689 in words is "three hundred twenty-eight million, eight hundred five thousand, six hundred eighty-nine".