12688188 has 72 divisors (see below), whose sum is σ = 32998896. Its totient is φ = 3778560.

The previous prime is 12688187. The next prime is 12688201. The reversal of 12688188 is 88188621.

12688188 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×12688188² = 321980229446688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12688187) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 309448 + ... + 309488.

It is an arithmetic number, because the mean of its divisors is an integer number (458318).

Almost surely, 2^12688188 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12688188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16499448).

12688188 is an abundant number, since it is smaller than the sum of its proper divisors (20310708).

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

12688188 is a wasteful number, since it uses less digits than its factorization.

12688188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143 (or 100 counting only the distinct ones).

The product of its digits is 49152, while the sum is 42.

The square root of 12688188 is about 3562.0482871516. The cubic root of 12688188 is about 233.2383005290.

The spelling of 12688188 in words is "twelve million, six hundred eighty-eight thousand, one hundred eighty-eight".