13028728 has 8 divisors (see below), whose sum is σ = 24428880. Its totient is φ = 6514360.

The previous prime is 13028707. The next prime is 13028731. The reversal of 13028728 is 82782031.

It is a tau number, because it is divible by the number of its divisors (8).

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 13028728.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 814288 + ... + 814303.

It is an arithmetic number, because the mean of its divisors is an integer number (3053610).

Almost surely, 2^13028728 is an apocalyptic number.

It is an amenable number.

13028728 is a deficient number, since it is larger than the sum of its proper divisors (11400152).

13028728 is a wasteful number, since it uses less digits than its factorization.

13028728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1628597 (or 1628593 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 13028728 is about 3609.5329337741. The cubic root of 13028728 is about 235.3065442751.

The spelling of 13028728 in words is "thirteen million, twenty-eight thousand, seven hundred twenty-eight".