12720647 has 12 divisors (see below), whose sum is σ = 13599960. Its totient is φ = 11877600.

The previous prime is 12720601. The next prime is 12720649. The reversal of 12720647 is 74602721.

It is not a de Polignac number, because 12720647 - 2²⁰ = 11672071 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12720649) 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, 125897 + ... + 125997.

It is an arithmetic number, because the mean of its divisors is an integer number (1133330).

Almost surely, 2^12720647 is an apocalyptic number.

12720647 is a deficient number, since it is larger than the sum of its proper divisors (879313).

12720647 is an equidigital number, since it uses as much as digits as its factorization.

12720647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 12720647 is about 3566.6016037679. The cubic root of 12720647 is about 233.4370217167.

The spelling of 12720647 in words is "twelve million, seven hundred twenty thousand, six hundred forty-seven".