216804366 has 48 divisors (see below), whose sum is σ = 508972464. Its totient is φ = 66431232.

The previous prime is 216804347. The next prime is 216804389. The reversal of 216804366 is 663408612.

216804366 is a `hidden beast` number, since 216 + 8 + 0 + 436 + 6 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 216804366.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4920 + ... + 21396.

It is an arithmetic number, because the mean of its divisors is an integer number (10603593).

Almost surely, 2^216804366 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216804366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254486232).

216804366 is an abundant number, since it is smaller than the sum of its proper divisors (292168098).

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

216804366 is a wasteful number, since it uses less digits than its factorization.

216804366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16545 (or 16542 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 216804366 is about 14724.2781147328. The cubic root of 216804366 is about 600.7438607376.

The spelling of 216804366 in words is "two hundred sixteen million, eight hundred four thousand, three hundred sixty-six".