13728815 has 16 divisors (see below), whose sum is σ = 17750016. Its totient is φ = 10164000.

The previous prime is 13728797. The next prime is 13728821. The reversal of 13728815 is 51882731.

It is not a de Polignac number, because 13728815 - 2¹² = 13724719 is a prime.

It is a super-2 number, since 2×13728815² = 376960722608450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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, 1640 + ... + 5490.

It is an arithmetic number, because the mean of its divisors is an integer number (1109376).

Almost surely, 2^13728815 is an apocalyptic number.

13728815 is a deficient number, since it is larger than the sum of its proper divisors (4021201).

13728815 is a wasteful number, since it uses less digits than its factorization.

13728815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3910.

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

The square root of 13728815 is about 3705.2415575776. The cubic root of 13728815 is about 239.4478917556.

The spelling of 13728815 in words is "thirteen million, seven hundred twenty-eight thousand, eight hundred fifteen".