216623243 has 8 divisors (see below), whose sum is σ = 228322800. Its totient is φ = 205205728.

The previous prime is 216623189. The next prime is 216623249. The reversal of 216623243 is 342326612.

216623243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216623243 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (216623249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68933 + ... + 72006.

It is an arithmetic number, because the mean of its divisors is an integer number (28540350).

Almost surely, 2^216623243 is an apocalyptic number.

216623243 is a deficient number, since it is larger than the sum of its proper divisors (11699557).

216623243 is a wasteful number, since it uses less digits than its factorization.

216623243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141021.

The product of its digits is 10368, while the sum is 29.

The square root of 216623243 is about 14718.1263413520. The cubic root of 216623243 is about 600.5765227104.

Adding to 216623243 its reverse (342326612), we get a palindrome (558949855).

The spelling of 216623243 in words is "two hundred sixteen million, six hundred twenty-three thousand, two hundred forty-three".