12667728 has 20 divisors (see below), whose sum is σ = 32725088. Its totient is φ = 4222560.

The previous prime is 12667667. The next prime is 12667777. The reversal of 12667728 is 82776621.

It is a congruent number.

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, 131908 + ... + 132003.

Almost surely, 2^12667728 is an apocalyptic number.

It is an amenable number.

12667728 is an abundant number, since it is smaller than the sum of its proper divisors (20057360).

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

12667728 is a wasteful number, since it uses less digits than its factorization.

12667728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263922 (or 263916 counting only the distinct ones).

The product of its digits is 56448, while the sum is 39.

The square root of 12667728 is about 3559.1751853484. The cubic root of 12667728 is about 233.1128656771.

The spelling of 12667728 in words is "twelve million, six hundred sixty-seven thousand, seven hundred twenty-eight".