12724666 has 8 divisors (see below), whose sum is σ = 19107540. Its totient is φ = 6355488.

The previous prime is 12724651. The next prime is 12724667. The reversal of 12724666 is 66642721.

It can be written as a sum of positive squares in 2 ways, for example, as 7756225 + 4968441 = 2785^2 + 2229^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (12724667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 651 + ... + 5086.

Almost surely, 2^12724666 is an apocalyptic number.

12724666 is a deficient number, since it is larger than the sum of its proper divisors (6382874).

12724666 is a wasteful number, since it uses less digits than its factorization.

12724666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6848.

The product of its digits is 24192, while the sum is 34.

The square root of 12724666 is about 3567.1649807655. The cubic root of 12724666 is about 233.4616033962.

The spelling of 12724666 in words is "twelve million, seven hundred twenty-four thousand, six hundred sixty-six".