12688299828 has 18 divisors (see below), whose sum is σ = 32073202434. Its totient is φ = 4229433264.

The previous prime is 12688299823. The next prime is 12688299829. The reversal of 12688299828 is 82899288621.

12688299828 is a `hidden beast` number, since 1 + 268 + 8 + 299 + 82 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12217323024 + 470976804 = 110532^2 + 21702^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12688299821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 176226351 + ... + 176226422.

Almost surely, 2^12688299828 is an apocalyptic number.

12688299828 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12688299828 is an abundant number, since it is smaller than the sum of its proper divisors (19384902606).

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

12688299828 is a wasteful number, since it uses less digits than its factorization.

12688299828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352452783 (or 352452778 counting only the distinct ones).

The product of its digits is 15925248, while the sum is 63.

The spelling of 12688299828 in words is "twelve billion, six hundred eighty-eight million, two hundred ninety-nine thousand, eight hundred twenty-eight".