12815728 has 20 divisors (see below), whose sum is σ = 26137960. Its totient is φ = 6070464.

The previous prime is 12815723. The next prime is 12815729. The reversal of 12815728 is 82751821.

It is a junction number, because it is equal to n+sod(n) for n = 12815693 and 12815702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12815723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20775 + ... + 21382.

It is an arithmetic number, because the mean of its divisors is an integer number (1306898).

Almost surely, 2^12815728 is an apocalyptic number.

It is an amenable number.

12815728 is an abundant number, since it is smaller than the sum of its proper divisors (13322232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12815728 is a wasteful number, since it uses less digits than its factorization.

12815728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42184 (or 42178 counting only the distinct ones).

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

The square root of 12815728 is about 3579.9061440211. The cubic root of 12815728 is about 234.0171901560.

The spelling of 12815728 in words is "twelve million, eight hundred fifteen thousand, seven hundred twenty-eight".