12320256 has 80 divisors (see below), whose sum is σ = 35403984. Its totient is φ = 3784704.

The previous prime is 12320239. The next prime is 12320267. The reversal of 12320256 is 65202321.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 19660 + ... + 20276.

Almost surely, 2^12320256 is an apocalyptic number.

12320256 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 12320256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17701992).

12320256 is an abundant number, since it is smaller than the sum of its proper divisors (23083728).

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

12320256 is an equidigital number, since it uses as much as digits as its factorization.

12320256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651 (or 635 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 12320256 is about 3510.0222221519. The cubic root of 12320256 is about 230.9616697707.

Adding to 12320256 its reverse (65202321), we get a palindrome (77522577).

The spelling of 12320256 in words is "twelve million, three hundred twenty thousand, two hundred fifty-six".