216633204 has 120 divisors (see below), whose sum is σ = 586686408. Its totient is φ = 69672960.

The previous prime is 216633203. The next prime is 216633223. The reversal of 216633204 is 402336612.

216633204 is a `hidden beast` number, since 2 + 1 + 6 + 633 + 20 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 14424804 + 202208400 = 3798^2 + 14220^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216633203) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1917052 + ... + 1917164.

Almost surely, 2^216633204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216633204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293343204).

216633204 is an abundant number, since it is smaller than the sum of its proper divisors (370053204).

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

216633204 is a wasteful number, since it uses less digits than its factorization.

216633204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 276 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 216633204 is about 14718.4647297196. The cubic root of 216633204 is about 600.5857280184.

Adding to 216633204 its reverse (402336612), we get a palindrome (618969816).

The spelling of 216633204 in words is "two hundred sixteen million, six hundred thirty-three thousand, two hundred four".