255131240 has 384 divisors, whose sum is σ = 827366400. Its totient is φ = 69672960.

The previous prime is 255131197. The next prime is 255131267. The reversal of 255131240 is 42131552.

It is a congruent number.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 8230025 + ... + 8230055.

It is an arithmetic number, because the mean of its divisors is an integer number (2154600).

Almost surely, 2^255131240 is an apocalyptic number.

255131240 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 255131240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (413683200).

255131240 is an abundant number, since it is smaller than the sum of its proper divisors (572235160).

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

255131240 is a wasteful number, since it uses less digits than its factorization.

255131240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 255131240 is about 15972.8281778776. The cubic root of 255131240 is about 634.2413408459.

Adding to 255131240 its reverse (42131552), we get a palindrome (297262792).

The spelling of 255131240 in words is "two hundred fifty-five million, one hundred thirty-one thousand, two hundred forty".