12500786728 has 8 divisors (see below), whose sum is σ = 23438975130. Its totient is φ = 6250393360.

The previous prime is 12500786723. The next prime is 12500786761. The reversal of 12500786728 is 82768700521.

12500786728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 6512812804 + 5987973924 = 80702^2 + 77382^2 .

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 (46) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (12500786723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 781299163 + ... + 781299178.

Almost surely, 2^12500786728 is an apocalyptic number.

It is an amenable number.

12500786728 is a deficient number, since it is larger than the sum of its proper divisors (10938188402).

12500786728 is a wasteful number, since it uses less digits than its factorization.

12500786728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562598347 (or 1562598343 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 46.

The spelling of 12500786728 in words is "twelve billion, five hundred million, seven hundred eighty-six thousand, seven hundred twenty-eight".