255236640 has 192 divisors, whose sum is σ = 879621120. Its totient is φ = 61931520.

The previous prime is 255236573. The next prime is 255236651. The reversal of 255236640 is 46632552.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 252456 + ... + 253464.

It is an arithmetic number, because the mean of its divisors is an integer number (4581360).

Almost surely, 2^255236640 is an apocalyptic number.

255236640 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 255236640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (439810560).

255236640 is an abundant number, since it is smaller than the sum of its proper divisors (624384480).

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

255236640 is a wasteful number, since it uses less digits than its factorization.

255236640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075 (or 1067 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 255236640 is about 15976.1271902799. The cubic root of 255236640 is about 634.3286682333.

The spelling of 255236640 in words is "two hundred fifty-five million, two hundred thirty-six thousand, six hundred forty".