12128823787 has 12 divisors (see below), whose sum is σ = 12574696680. Its totient is φ = 11698269632.

The previous prime is 12128823731. The next prime is 12128823799. The reversal of 12128823787 is 78732882121.

It is a happy number.

It is not a de Polignac number, because 12128823787 - 2¹⁵ = 12128791019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12128823787.

It is not an unprimeable number, because it can be changed into a prime (12128820787) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 849903 + ... + 864055.

It is an arithmetic number, because the mean of its divisors is an integer number (1047891390).

Almost surely, 2^12128823787 is an apocalyptic number.

12128823787 is a deficient number, since it is larger than the sum of its proper divisors (445872893).

12128823787 is a wasteful number, since it uses less digits than its factorization.

12128823787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15230 (or 15201 counting only the distinct ones).

The product of its digits is 602112, while the sum is 49.

The spelling of 12128823787 in words is "twelve billion, one hundred twenty-eight million, eight hundred twenty-three thousand, seven hundred eighty-seven".