23216643 has 6 divisors (see below), whose sum is σ = 33535164. Its totient is φ = 15477756.

The previous prime is 23216621. The next prime is 23216663. The reversal of 23216643 is 34661232.

23216643 is a `hidden beast` number, since 2 + 3 + 2 + 16 + 643 = 666.

It is not a de Polignac number, because 23216643 - 2⁸ = 23216387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23216663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1289805 + ... + 1289822.

It is an arithmetic number, because the mean of its divisors is an integer number (5589194).

Almost surely, 2^23216643 is an apocalyptic number.

23216643 is a deficient number, since it is larger than the sum of its proper divisors (10318521).

23216643 is a wasteful number, since it uses less digits than its factorization.

23216643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2579633 (or 2579630 counting only the distinct ones).

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

The square root of 23216643 is about 4818.3651791868. The cubic root of 23216643 is about 285.2768132305.

Adding to 23216643 its reverse (34661232), we get a palindrome (57877875).

The spelling of 23216643 in words is "twenty-three million, two hundred sixteen thousand, six hundred forty-three".