255331440 has 400 divisors, whose sum is σ = 1093971648. Its totient is φ = 53747712.

The previous prime is 255331423. The next prime is 255331459. The reversal of 255331440 is 44133552.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 589464 + ... + 589896.

Almost surely, 2^255331440 is an apocalyptic number.

255331440 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 255331440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (546985824).

255331440 is an abundant number, since it is smaller than the sum of its proper divisors (838640208).

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

255331440 is a wasteful number, since it uses less digits than its factorization.

255331440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 463 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 255331440 is about 15979.0938416420. The cubic root of 255331440 is about 634.4071926362.

Adding to 255331440 its reverse (44133552), we get a palindrome (299464992).

The spelling of 255331440 in words is "two hundred fifty-five million, three hundred thirty-one thousand, four hundred forty".