12649436928 has 108 divisors (see below), whose sum is σ = 37822425368. Its totient is φ = 4216458240.

The previous prime is 12649436909. The next prime is 12649436929. The reversal of 12649436928 is 82963494621.

12649436928 is a `hidden beast` number, since 126 + 494 + 3 + 6 + 9 + 28 = 666.

12649436928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (108).

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12649436929) 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 11 ways as a sum of consecutive naturals, for example, 39463 + ... + 163878.

Almost surely, 2^12649436928 is an apocalyptic number.

12649436928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12649436928 is an abundant number, since it is smaller than the sum of its proper divisors (25172988440).

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

12649436928 is an frugal number, since it uses more digits than its factorization.

12649436928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203372 (or 203346 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The spelling of 12649436928 in words is "twelve billion, six hundred forty-nine million, four hundred thirty-six thousand, nine hundred twenty-eight".