12643428 has 24 divisors (see below), whose sum is σ = 33716032. Its totient is φ = 3612384.

The previous prime is 12643387. The next prime is 12643439. The reversal of 12643428 is 82434621.

It is a junction number, because it is equal to n+sod(n) for n = 12643395 and 12643404.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75175 + ... + 75342.

Almost surely, 2^12643428 is an apocalyptic number.

It is an amenable number.

12643428 is an abundant number, since it is smaller than the sum of its proper divisors (21072604).

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

12643428 is a wasteful number, since it uses less digits than its factorization.

12643428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150531 (or 150529 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

The square root of 12643428 is about 3555.7598344095. The cubic root of 12643428 is about 232.9637132117.

The spelling of 12643428 in words is "twelve million, six hundred forty-three thousand, four hundred twenty-eight".