13130728 has 16 divisors (see below), whose sum is σ = 26514180. Its totient is φ = 6060288.

The previous prime is 13130717. The next prime is 13130743. The reversal of 13130728 is 82703131.

13130728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 13089924 + 40804 = 3618^2 + 202^2 .

It is a plaindrome in base 15.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63025 + ... + 63232.

Almost surely, 2^13130728 is an apocalyptic number.

It is an amenable number.

13130728 is an abundant number, since it is smaller than the sum of its proper divisors (13383452).

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

13130728 is a wasteful number, since it uses less digits than its factorization.

13130728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126276 (or 126272 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 13130728 is about 3623.6346394194. The cubic root of 13130728 is about 235.9190088837.

Adding to 13130728 its reverse (82703131), we get a palindrome (95833859).

The spelling of 13130728 in words is "thirteen million, one hundred thirty thousand, seven hundred twenty-eight".