13660544 has 64 divisors (see below), whose sum is σ = 29559600. Its totient is φ = 6266880.

The previous prime is 13660531. The next prime is 13660547. The reversal of 13660544 is 44506631.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×13660544² = 373220924751872, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13660547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99644 + ... + 99780.

Almost surely, 2^13660544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13660544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14779800).

13660544 is an abundant number, since it is smaller than the sum of its proper divisors (15899056).

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

13660544 is a wasteful number, since it uses less digits than its factorization.

13660544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 199 counting only the distinct ones).

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

The square root of 13660544 is about 3696.0173159768. The cubic root of 13660544 is about 239.0503211561.

The spelling of 13660544 in words is "thirteen million, six hundred sixty thousand, five hundred forty-four".