23218644 has 12 divisors (see below), whose sum is σ = 54176864. Its totient is φ = 7739544.

The previous prime is 23218631. The next prime is 23218673. The reversal of 23218644 is 44681232.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 967432 + ... + 967455.

Almost surely, 2^23218644 is an apocalyptic number.

It is an amenable number.

23218644 is an abundant number, since it is smaller than the sum of its proper divisors (30958220).

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

23218644 is a wasteful number, since it uses less digits than its factorization.

23218644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1934894 (or 1934892 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

The square root of 23218644 is about 4818.5728177542. The cubic root of 23218644 is about 285.2850088239.

Adding to 23218644 its reverse (44681232), we get a palindrome (67899876).

The spelling of 23218644 in words is "twenty-three million, two hundred eighteen thousand, six hundred forty-four".