12784656 has 40 divisors (see below), whose sum is σ = 33435360. Its totient is φ = 4208896.

The previous prime is 12784643. The next prime is 12784687. The reversal of 12784656 is 65648721.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2380 + ... + 5588.

It is an arithmetic number, because the mean of its divisors is an integer number (835884).

Almost surely, 2^12784656 is an apocalyptic number.

12784656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12784656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16717680).

12784656 is an abundant number, since it is smaller than the sum of its proper divisors (20650704).

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

12784656 is a wasteful number, since it uses less digits than its factorization.

12784656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3303 (or 3297 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 12784656 is about 3575.5637317771. The cubic root of 12784656 is about 233.8279105823.

The spelling of 12784656 in words is "twelve million, seven hundred eighty-four thousand, six hundred fifty-six".