23215566 has 16 divisors (see below), whose sum is σ = 50652288. Its totient is φ = 7035000.

The previous prime is 23215547. The next prime is 23215597. The reversal of 23215566 is 66551232.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175810 + ... + 175941.

It is an arithmetic number, because the mean of its divisors is an integer number (3165768).

Almost surely, 2^23215566 is an apocalyptic number.

23215566 is an abundant number, since it is smaller than the sum of its proper divisors (27436722).

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

23215566 is a wasteful number, since it uses less digits than its factorization.

23215566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351767.

The product of its digits is 10800, while the sum is 30.

The square root of 23215566 is about 4818.2534179929. The cubic root of 23215566 is about 285.2724019140.

Adding to 23215566 its reverse (66551232), we get a palindrome (89766798).

It can be divided in two parts, 232155 and 66, that added together give a triangular number (232221 = T₆₈₁).

The spelling of 23215566 in words is "twenty-three million, two hundred fifteen thousand, five hundred sixty-six".