256722312 has 192 divisors, whose sum is σ = 822003840. Its totient is φ = 65387520.

The previous prime is 256722311. The next prime is 256722329. The reversal of 256722312 is 213227652.

It is a self number, because there is not a number n which added to its sum of digits gives 256722312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256722311) 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 47 ways as a sum of consecutive naturals, for example, 1483858 + ... + 1484030.

It is an arithmetic number, because the mean of its divisors is an integer number (4281270).

Almost surely, 2^256722312 is an apocalyptic number.

256722312 is a gapful number since it is divisible by the number (22) 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 256722312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (411001920).

256722312 is an abundant number, since it is smaller than the sum of its proper divisors (565281528).

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

256722312 is a wasteful number, since it uses less digits than its factorization.

256722312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284 (or 269 counting only the distinct ones).

The product of its digits is 10080, while the sum is 30.

The square root of 256722312 is about 16022.5563503456. The cubic root of 256722312 is about 635.5570468955.

Adding to 256722312 its reverse (213227652), we get a palindrome (469949964).

The spelling of 256722312 in words is "two hundred fifty-six million, seven hundred twenty-two thousand, three hundred twelve".