13506728 has 8 divisors (see below), whose sum is σ = 25325130. Its totient is φ = 6753360.

The previous prime is 13506707. The next prime is 13506733. The reversal of 13506728 is 82760531.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 9498724 + 4008004 = 3082^2 + 2002^2 .

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 = 13506694 and 13506703.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844163 + ... + 844178.

Almost surely, 2^13506728 is an apocalyptic number.

It is an amenable number.

13506728 is a deficient number, since it is larger than the sum of its proper divisors (11818402).

13506728 is a wasteful number, since it uses less digits than its factorization.

13506728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688347 (or 1688343 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 13506728 is about 3675.1500649633. The cubic root of 13506728 is about 238.1497069084.

The spelling of 13506728 in words is "thirteen million, five hundred six thousand, seven hundred twenty-eight".