256223312 has 40 divisors (see below), whose sum is σ = 526841280. Its totient is φ = 120454400.

The previous prime is 256223311. The next prime is 256223321. The reversal of 256223312 is 213322652.

It is a super-2 number, since 2×256223312² = 131300771224498688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256223311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15812 + ... + 27612.

It is an arithmetic number, because the mean of its divisors is an integer number (13171032).

Almost surely, 2^256223312 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 256223312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263420640).

256223312 is an abundant number, since it is smaller than the sum of its proper divisors (270617968).

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

256223312 is a wasteful number, since it uses less digits than its factorization.

256223312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11891 (or 11885 counting only the distinct ones).

The product of its digits is 4320, while the sum is 26.

The square root of 256223312 is about 16006.9769788052. The cubic root of 256223312 is about 635.1449950995.

Adding to 256223312 its reverse (213322652), we get a palindrome (469545964).

The spelling of 256223312 in words is "two hundred fifty-six million, two hundred twenty-three thousand, three hundred twelve".