12730645 has 4 divisors (see below), whose sum is σ = 15276780. Its totient is φ = 10184512.

The previous prime is 12730631. The next prime is 12730651. The reversal of 12730645 is 54603721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8625969 + 4104676 = 2937^2 + 2026^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12730645 is a prime.

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, 1273060 + ... + 1273069.

It is an arithmetic number, because the mean of its divisors is an integer number (3819195).

Almost surely, 2^12730645 is an apocalyptic number.

It is an amenable number.

12730645 is a deficient number, since it is larger than the sum of its proper divisors (2546135).

12730645 is an equidigital number, since it uses as much as digits as its factorization.

12730645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2546134.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 12730645 is about 3568.0029428239. The cubic root of 12730645 is about 233.4981635793.

The spelling of 12730645 in words is "twelve million, seven hundred thirty thousand, six hundred forty-five".