12981648 has 20 divisors (see below), whose sum is σ = 33536048. Its totient is φ = 4327200.

The previous prime is 12981643. The next prime is 12981649. The reversal of 12981648 is 84618921.

It is not an unprimeable number, because it can be changed into a prime (12981643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135178 + ... + 135273.

Almost surely, 2^12981648 is an apocalyptic number.

It is an amenable number.

12981648 is an abundant number, since it is smaller than the sum of its proper divisors (20554400).

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

12981648 is a wasteful number, since it uses less digits than its factorization.

12981648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270462 (or 270456 counting only the distinct ones).

The product of its digits is 27648, while the sum is 39.

The square root of 12981648 is about 3603.0054121525. The cubic root of 12981648 is about 235.0227712957.

Subtracting from 12981648 its sum of digits (39), we obtain a square (12981609 = 3603²).

The spelling of 12981648 in words is "twelve million, nine hundred eighty-one thousand, six hundred forty-eight".