13581728 has 12 divisors (see below), whose sum is σ = 26739090. Its totient is φ = 6790848.

The previous prime is 13581719. The next prime is 13581739. The reversal of 13581728 is 82718531.

It can be written as a sum of positive squares in only one way, i.e., 12475024 + 1106704 = 3532^2 + 1052^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212183 + ... + 212246.

Almost surely, 2^13581728 is an apocalyptic number.

It is an amenable number.

13581728 is a deficient number, since it is larger than the sum of its proper divisors (13157362).

13581728 is an equidigital number, since it uses as much as digits as its factorization.

13581728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424439 (or 424431 counting only the distinct ones).

The product of its digits is 13440, while the sum is 35.

The square root of 13581728 is about 3685.3396044327. The cubic root of 13581728 is about 238.5896918245.

The spelling of 13581728 in words is "thirteen million, five hundred eighty-one thousand, seven hundred twenty-eight".