12689128 has 16 divisors (see below), whose sum is σ = 24346080. Its totient is φ = 6196848.

The previous prime is 12689099. The next prime is 12689129. The reversal of 12689128 is 82198621.

12689128 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 2×12689128² = 322027938800768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12689129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18100 + ... + 18787.

It is an arithmetic number, because the mean of its divisors is an integer number (1521630).

Almost surely, 2^12689128 is an apocalyptic number.

It is an amenable number.

12689128 is a deficient number, since it is larger than the sum of its proper divisors (11656952).

12689128 is a wasteful number, since it uses less digits than its factorization.

12689128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36936 (or 36932 counting only the distinct ones).

The product of its digits is 13824, while the sum is 37.

The square root of 12689128 is about 3562.1802312629. The cubic root of 12689128 is about 233.2440601796.

The spelling of 12689128 in words is "twelve million, six hundred eighty-nine thousand, one hundred twenty-eight".