12781568 has 36 divisors (see below), whose sum is σ = 25884495. Its totient is φ = 6309888.

The previous prime is 12781567. The next prime is 12781589. The reversal of 12781568 is 86518721.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 6390784 + 6390784 = 2528^2 + 2528^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=2528.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12781567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 161753 + ... + 161831.

Almost surely, 2^12781568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12781568

12781568 is an abundant number, since it is smaller than the sum of its proper divisors (13102927).

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

12781568 is an frugal number, since it uses more digits than its factorization.

12781568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 81 counting only the distinct ones).

The product of its digits is 26880, while the sum is 38.

The square root of 12781568 is about 3575.1318856792. The cubic root of 12781568 is about 233.8090828372.

The spelling of 12781568 in words is "twelve million, seven hundred eighty-one thousand, five hundred sixty-eight".