12666628 has 12 divisors (see below), whose sum is σ = 23871820. Its totient is φ = 5846112.

The previous prime is 12666607. The next prime is 12666671. The reversal of 12666628 is 82666621.

It can be written as a sum of positive squares in 2 ways, for example, as 777924 + 11888704 = 882^2 + 3448^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121743 + ... + 121846.

Almost surely, 2^12666628 is an apocalyptic number.

It is an amenable number.

12666628 is a deficient number, since it is larger than the sum of its proper divisors (11205192).

12666628 is a wasteful number, since it uses less digits than its factorization.

12666628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243606 (or 243604 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The square root of 12666628 is about 3559.0206518086. The cubic root of 12666628 is about 233.1061180432.

The spelling of 12666628 in words is "twelve million, six hundred sixty-six thousand, six hundred twenty-eight".