13500728 has 8 divisors (see below), whose sum is σ = 25313880. Its totient is φ = 6750360.

The previous prime is 13500691. The next prime is 13500733. The reversal of 13500728 is 82700531.

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

It is a junction number, because it is equal to n+sod(n) for n = 13500697 and 13500706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843788 + ... + 843803.

It is an arithmetic number, because the mean of its divisors is an integer number (3164235).

Almost surely, 2^13500728 is an apocalyptic number.

It is an amenable number.

13500728 is a deficient number, since it is larger than the sum of its proper divisors (11813152).

13500728 is a wasteful number, since it uses less digits than its factorization.

13500728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1687597 (or 1687593 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 13500728 is about 3674.3336810910. Note that the first 3 decimals coincide. The cubic root of 13500728 is about 238.1144378219.

The spelling of 13500728 in words is "thirteen million, five hundred thousand, seven hundred twenty-eight".