13644065 has 16 divisors (see below), whose sum is σ = 17182800. Its totient is φ = 10386432.

The previous prime is 13644041. The next prime is 13644073. The reversal of 13644065 is 56044631.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 277729 + 13366336 = 527^2 + 3656^2 .

It is a cyclic number.

It is not a de Polignac number, because 13644065 - 2¹⁰ = 13643041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9941 + ... + 11229.

It is an arithmetic number, because the mean of its divisors is an integer number (1073925).

Almost surely, 2^13644065 is an apocalyptic number.

It is an amenable number.

13644065 is a deficient number, since it is larger than the sum of its proper divisors (3538735).

13644065 is a wasteful number, since it uses less digits than its factorization.

13644065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 13644065 is about 3693.7873517570. The cubic root of 13644065 is about 238.9541586770.

Adding to 13644065 its reverse (56044631), we get a palindrome (69688696).

The spelling of 13644065 in words is "thirteen million, six hundred forty-four thousand, sixty-five".