12680649 has 6 divisors (see below), whose sum is σ = 18316506. Its totient is φ = 8453760.

The previous prime is 12680641. The next prime is 12680653. The reversal of 12680649 is 94608621.

12680649 is a `hidden beast` number, since 1 + 2 + 6 + 8 + 0 + 649 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10017225 + 2663424 = 3165^2 + 1632^2 .

It is not a de Polignac number, because 12680649 - 2³ = 12680641 is a prime.

It is a super-2 number, since 2×12680649² = 321597718122402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12680641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 704472 + ... + 704489.

It is an arithmetic number, because the mean of its divisors is an integer number (3052751).

Almost surely, 2^12680649 is an apocalyptic number.

It is an amenable number.

12680649 is a deficient number, since it is larger than the sum of its proper divisors (5635857).

12680649 is a wasteful number, since it uses less digits than its factorization.

12680649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1408967 (or 1408964 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 12680649 is about 3560.9898904659. The cubic root of 12680649 is about 233.1920966128.

The spelling of 12680649 in words is "twelve million, six hundred eighty thousand, six hundred forty-nine".