13318644 has 12 divisors (see below), whose sum is σ = 31076864. Its totient is φ = 4439544.

The previous prime is 13318619. The next prime is 13318649. The reversal of 13318644 is 44681331.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13318649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 554932 + ... + 554955.

Almost surely, 2^13318644 is an apocalyptic number.

It is an amenable number.

13318644 is an abundant number, since it is smaller than the sum of its proper divisors (17758220).

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

13318644 is a wasteful number, since it uses less digits than its factorization.

13318644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109894 (or 1109892 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 13318644 is about 3649.4717425951. The cubic root of 13318644 is about 237.0391076485.

Adding to 13318644 its reverse (44681331), we get a palindrome (57999975).

The spelling of 13318644 in words is "thirteen million, three hundred eighteen thousand, six hundred forty-four".