12512728 has 8 divisors (see below), whose sum is σ = 23461380. Its totient is φ = 6256360.

The previous prime is 12512723. The next prime is 12512737. The reversal of 12512728 is 82721521.

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

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 12512696 and 12512705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12512723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 782038 + ... + 782053.

Almost surely, 2^12512728 is an apocalyptic number.

It is an amenable number.

12512728 is a deficient number, since it is larger than the sum of its proper divisors (10948652).

12512728 is a wasteful number, since it uses less digits than its factorization.

12512728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564097 (or 1564093 counting only the distinct ones).

The product of its digits is 2240, while the sum is 28.

The square root of 12512728 is about 3537.3334589773. Note that the first 3 decimals coincide. The cubic root of 12512728 is about 232.1581858168.

The spelling of 12512728 in words is "twelve million, five hundred twelve thousand, seven hundred twenty-eight".