13207728 has 20 divisors (see below), whose sum is σ = 34120088. Its totient is φ = 4402560.

The previous prime is 13207723. The next prime is 13207729. The reversal of 13207728 is 82770231.

It is a junction number, because it is equal to n+sod(n) for n = 13207695 and 13207704.

It is not an unprimeable number, because it can be changed into a prime (13207721) 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, 137533 + ... + 137628.

Almost surely, 2^13207728 is an apocalyptic number.

It is an amenable number.

13207728 is an abundant number, since it is smaller than the sum of its proper divisors (20912360).

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

13207728 is a wasteful number, since it uses less digits than its factorization.

13207728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275172 (or 275166 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 13207728 is about 3634.2438002974. The cubic root of 13207728 is about 236.3792618682.

Adding to 13207728 its reverse (82770231), we get a palindrome (95977959).

The spelling of 13207728 in words is "thirteen million, two hundred seven thousand, seven hundred twenty-eight".