13001728 has 22 divisors (see below), whose sum is σ = 25992806. Its totient is φ = 6500352.

The previous prime is 13001717. The next prime is 13001731. The reversal of 13001728 is 82710031.

It can be written as a sum of positive squares in only one way, i.e., 9437184 + 3564544 = 3072^2 + 1888^2 .

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 13001699 and 13001708.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5325 + ... + 7372.

Almost surely, 2^13001728 is an apocalyptic number.

It is an amenable number.

13001728 is a deficient number, since it is larger than the sum of its proper divisors (12991078).

13001728 is an equidigital number, since it uses as much as digits as its factorization.

13001728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12717 (or 12699 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 13001728 is about 3605.7908979862. The cubic root of 13001728 is about 235.1438865319.

Adding to 13001728 its reverse (82710031), we get a palindrome (95711759).

The spelling of 13001728 in words is "thirteen million, one thousand, seven hundred twenty-eight".