12728678427 has 6 divisors (see below), whose sum is σ = 18385868852. Its totient is φ = 8485785612.

The previous prime is 12728678407. The next prime is 12728678429. The reversal of 12728678427 is 72487682721.

12728678427 is a `hidden beast` number, since 1 + 2 + 72 + 86 + 78 + 427 = 666.

12728678427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12728678427 - 2⁶ = 12728678363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12728678429) 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 in 5 ways as a sum of consecutive naturals, for example, 707148793 + ... + 707148810.

Almost surely, 2^12728678427 is an apocalyptic number.

12728678427 is a deficient number, since it is larger than the sum of its proper divisors (5657190425).

12728678427 is a wasteful number, since it uses less digits than its factorization.

12728678427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414297609 (or 1414297606 counting only the distinct ones).

The product of its digits is 4214784, while the sum is 54.

The spelling of 12728678427 in words is "twelve billion, seven hundred twenty-eight million, six hundred seventy-eight thousand, four hundred twenty-seven".