13381728 has 24 divisors (see below), whose sum is σ = 35127288. Its totient is φ = 4460544.

The previous prime is 13381727. The next prime is 13381747. The reversal of 13381728 is 82718331.

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13381727) 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, 69601 + ... + 69792.

It is an arithmetic number, because the mean of its divisors is an integer number (1463637).

Almost surely, 2^13381728 is an apocalyptic number.

It is an amenable number.

13381728 is an abundant number, since it is smaller than the sum of its proper divisors (21745560).

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

13381728 is a wasteful number, since it uses less digits than its factorization.

13381728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139406 (or 139398 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 13381728 is about 3658.1044271590. The cubic root of 13381728 is about 237.4127650073.

The spelling of 13381728 in words is "thirteen million, three hundred eighty-one thousand, seven hundred twenty-eight".