13728566 has 4 divisors (see below), whose sum is σ = 20592852. Its totient is φ = 6864282.

The previous prime is 13728529. The next prime is 13728577. The reversal of 13728566 is 66582731.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3432140 + ... + 3432143.

It is an arithmetic number, because the mean of its divisors is an integer number (5148213).

Almost surely, 2^13728566 is an apocalyptic number.

13728566 is a deficient number, since it is larger than the sum of its proper divisors (6864286).

13728566 is an equidigital number, since it uses as much as digits as its factorization.

13728566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6864285.

The product of its digits is 60480, while the sum is 38.

The square root of 13728566 is about 3705.2079563771. The cubic root of 13728566 is about 239.4464441219.

The spelling of 13728566 in words is "thirteen million, seven hundred twenty-eight thousand, five hundred sixty-six".