15128728 has 16 divisors (see below), whose sum is σ = 28517760. Its totient is φ = 7524000.

The previous prime is 15128723. The next prime is 15128741. The reversal of 15128728 is 82782151.

15128728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 15128693 and 15128702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15128723) 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, 3423 + ... + 6478.

It is an arithmetic number, because the mean of its divisors is an integer number (1782360).

Almost surely, 2^15128728 is an apocalyptic number.

It is an amenable number.

15128728 is a deficient number, since it is larger than the sum of its proper divisors (13389032).

15128728 is a wasteful number, since it uses less digits than its factorization.

15128728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10098 (or 10094 counting only the distinct ones).

The product of its digits is 8960, while the sum is 34.

The square root of 15128728 is about 3889.5665568287. The cubic root of 15128728 is about 247.3246889660.

The spelling of 15128728 in words is "fifteen million, one hundred twenty-eight thousand, seven hundred twenty-eight".