12730644 has 18 divisors (see below), whose sum is σ = 32180330. Its totient is φ = 4243536.

The previous prime is 12730631. The next prime is 12730651. The reversal of 12730644 is 44603721.

12730644 is a `hidden beast` number, since 12 + 7 + 3 + 0 + 644 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8928144 + 3802500 = 2988^2 + 1950^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 176779 + ... + 176850.

Almost surely, 2^12730644 is an apocalyptic number.

It is an amenable number.

12730644 is an abundant number, since it is smaller than the sum of its proper divisors (19449686).

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

12730644 is a wasteful number, since it uses less digits than its factorization.

12730644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353639 (or 353634 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 12730644 is about 3568.0028026895. The cubic root of 12730644 is about 233.4981574655.

The spelling of 12730644 in words is "twelve million, seven hundred thirty thousand, six hundred forty-four".