216623204 has 12 divisors (see below), whose sum is σ = 433246464. Its totient is φ = 92838504.

The previous prime is 216623189. The next prime is 216623249. The reversal of 216623204 is 402326612.

216623204 is an admirable number.

It is a super-2 number, since 2×216623204² = 93851225022451232, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 3868244 + ... + 3868299.

It is an arithmetic number, because the mean of its divisors is an integer number (36103872).

Almost surely, 2^216623204 is an apocalyptic number.

It is an amenable number.

216623204 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

216623204 is a wasteful number, since it uses less digits than its factorization.

216623204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7736554 (or 7736552 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 216623204 is about 14718.1250164551. The cubic root of 216623204 is about 600.5764866685.

Adding to 216623204 its reverse (402326612), we get a palindrome (618949816).

The spelling of 216623204 in words is "two hundred sixteen million, six hundred twenty-three thousand, two hundred four".