216686328 has 32 divisors (see below), whose sum is σ = 542097360. Its totient is φ = 72177920.

The previous prime is 216686299. The next prime is 216686329. The reversal of 216686328 is 823686612.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 216686328.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216686329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49276 + ... + 53492.

Almost surely, 2^216686328 is an apocalyptic number.

It is an amenable number.

216686328 is an abundant number, since it is smaller than the sum of its proper divisors (325411032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216686328 is a wasteful number, since it uses less digits than its factorization.

216686328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6367 (or 6363 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The square root of 216686328 is about 14720.2692910150. The cubic root of 216686328 is about 600.6348169976.

The spelling of 216686328 in words is "two hundred sixteen million, six hundred eighty-six thousand, three hundred twenty-eight".