216990323 has 8 divisors (see below), whose sum is σ = 237311856. Its totient is φ = 196768000.

The previous prime is 216990313. The next prime is 216990331. The reversal of 216990323 is 323099612.

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

It is not a de Polignac number, because 216990323 - 2⁴ = 216990307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216990313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20186 + ... + 29007.

It is an arithmetic number, because the mean of its divisors is an integer number (29663982).

Almost surely, 2^216990323 is an apocalyptic number.

216990323 is a deficient number, since it is larger than the sum of its proper divisors (20321533).

216990323 is a wasteful number, since it uses less digits than its factorization.

216990323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49605.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 216990323 is about 14730.5914002120. The cubic root of 216990323 is about 600.9155679224.

The spelling of 216990323 in words is "two hundred sixteen million, nine hundred ninety thousand, three hundred twenty-three".