216623300 has 18 divisors (see below), whose sum is σ = 470072778. Its totient is φ = 86649280.

The previous prime is 216623273. The next prime is 216623321. The reversal of 216623300 is 3326612.

It can be written as a sum of positive squares in 3 ways, for example, as 6431296 + 210192004 = 2536^2 + 14498^2 .

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 5 ways as a sum of consecutive naturals, for example, 1083017 + ... + 1083216.

Almost surely, 2^216623300 is an apocalyptic number.

216623300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216623300 is an abundant number, since it is smaller than the sum of its proper divisors (253449478).

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

216623300 is a wasteful number, since it uses less digits than its factorization.

216623300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166247 (or 2166240 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 216623300 is about 14718.1282777397. The cubic root of 216623300 is about 600.5765753869.

Adding to 216623300 its reverse (3326612), we get a palindrome (219949912).

The spelling of 216623300 in words is "two hundred sixteen million, six hundred twenty-three thousand, three hundred".