12857291784 has 64 divisors (see below), whose sum is σ = 35725881600. Its totient is φ = 4284422208.

The previous prime is 12857291779. The next prime is 12857291789. The reversal of 12857291784 is 48719275821.

12857291784 is a `hidden beast` number, since 1 + 285 + 7 + 291 + 78 + 4 = 666.

12857291784 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12857291779) and next prime (12857291789).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 12857291784.

It is not an unprimeable number, because it can be changed into a prime (12857291789) 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 15 ways as a sum of consecutive naturals, for example, 876817 + ... + 891359.

It is an arithmetic number, because the mean of its divisors is an integer number (558216900).

Almost surely, 2^12857291784 is an apocalyptic number.

It is an amenable number.

12857291784 is an abundant number, since it is smaller than the sum of its proper divisors (22868589816).

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

12857291784 is a wasteful number, since it uses less digits than its factorization.

12857291784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18651 (or 18641 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 54.

The spelling of 12857291784 in words is "twelve billion, eight hundred fifty-seven million, two hundred ninety-one thousand, seven hundred eighty-four".