328805690 has 8 divisors (see below), whose sum is σ = 591850260. Its totient is φ = 131522272.

The previous prime is 328805669. The next prime is 328805707. The reversal of 328805690 is 96508823.

It is a Cunningham number, because it is equal to 18133²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 328805689 + 1 = 18133^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×328805690² = 216226363552752200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16440275 + ... + 16440294.

Almost surely, 2^328805690 is an apocalyptic number.

328805690 is a deficient number, since it is larger than the sum of its proper divisors (263044570).

328805690 is a wasteful number, since it uses less digits than its factorization.

328805690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32880576.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 328805690 is about 18133.0000275740. Note that the first 4 decimals coincide. The cubic root of 328805690 is about 690.2076599644.

The spelling of 328805690 in words is "three hundred twenty-eight million, eight hundred five thousand, six hundred ninety".