255721312 has 96 divisors (see below), whose sum is σ = 637459200. Its totient is φ = 98081280.

The previous prime is 255721289. The next prime is 255721321. The reversal of 255721312 is 213127552.

It is a super-2 number, since 2×255721312² = 130786778822002688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164314 + ... + 165862.

It is an arithmetic number, because the mean of its divisors is an integer number (6640200).

Almost surely, 2^255721312 is an apocalyptic number.

255721312 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 255721312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (318729600).

255721312 is an abundant number, since it is smaller than the sum of its proper divisors (381737888).

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

255721312 is a wasteful number, since it uses less digits than its factorization.

255721312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644 (or 1636 counting only the distinct ones).

The product of its digits is 4200, while the sum is 28.

The square root of 255721312 is about 15991.2886285002. The cubic root of 255721312 is about 634.7299258635.

Adding to 255721312 its reverse (213127552), we get a palindrome (468848864).

The spelling of 255721312 in words is "two hundred fifty-five million, seven hundred twenty-one thousand, three hundred twelve".