12608721 has 12 divisors (see below), whose sum is σ = 18254340. Its totient is φ = 8386560.

The previous prime is 12608711. The next prime is 12608767. The reversal of 12608721 is 12780621.

It can be written as a sum of positive squares in 2 ways, for example, as 1718721 + 10890000 = 1311^2 + 3300^2 .

It is not a de Polignac number, because 12608721 - 2⁷ = 12608593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12608711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3345 + ... + 6033.

It is an arithmetic number, because the mean of its divisors is an integer number (1521195).

Almost surely, 2^12608721 is an apocalyptic number.

It is an amenable number.

12608721 is a deficient number, since it is larger than the sum of its proper divisors (5645619).

12608721 is a wasteful number, since it uses less digits than its factorization.

12608721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3216 (or 3213 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 12608721 is about 3550.8760890800. The cubic root of 12608721 is about 232.7503512112.

The spelling of 12608721 in words is "twelve million, six hundred eight thousand, seven hundred twenty-one".