255311440 has 80 divisors (see below), whose sum is σ = 632048832. Its totient is φ = 95578112.

The previous prime is 255311429. The next prime is 255311449. The reversal of 255311440 is 44113552.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255311449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308307 + ... + 309133.

Almost surely, 2^255311440 is an apocalyptic number.

255311440 is a gapful number since it is divisible by the number (20) 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 255311440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (316024416).

255311440 is an abundant number, since it is smaller than the sum of its proper divisors (376737392).

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

255311440 is a wasteful number, since it uses less digits than its factorization.

255311440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084 (or 1078 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 255311440 is about 15978.4680116712. The cubic root of 255311440 is about 634.3906279244.

Adding to 255311440 its reverse (44113552), we get a palindrome (299424992).

The spelling of 255311440 in words is "two hundred fifty-five million, three hundred eleven thousand, four hundred forty".