23985566 has 24 divisors (see below), whose sum is σ = 40039272. Its totient is φ = 10687200.

The previous prime is 23985551. The next prime is 23985569. The reversal of 23985566 is 66558932.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23985569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81716 + ... + 82008.

It is an arithmetic number, because the mean of its divisors is an integer number (1668303).

Almost surely, 2^23985566 is an apocalyptic number.

23985566 is a deficient number, since it is larger than the sum of its proper divisors (16053706).

23985566 is a wasteful number, since it uses less digits than its factorization.

23985566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428 (or 367 counting only the distinct ones).

The product of its digits is 388800, while the sum is 44.

The square root of 23985566 is about 4897.5061000472. The cubic root of 23985566 is about 288.3920762698.

It can be divided in two parts, 23 and 985566, that added together give a palindrome (985589).

The spelling of 23985566 in words is "twenty-three million, nine hundred eighty-five thousand, five hundred sixty-six".