255639888 has 280 divisors, whose sum is σ = 884752896. Its totient is φ = 69984000.

The previous prime is 255639877. The next prime is 255639913. The reversal of 255639888 is 888936552.

255639888 is a `hidden beast` number, since 2 + 556 + 3 + 9 + 8 + 88 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

Its product of digits (4147200) is a multiple of the sum of its prime divisors (144).

It is a congruent number.

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 55 ways as a sum of consecutive naturals, for example, 2531038 + ... + 2531138.

Almost surely, 2^255639888 is an apocalyptic number.

255639888 is a gapful number since it is divisible by the number (28) 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 255639888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (442376448).

255639888 is an abundant number, since it is smaller than the sum of its proper divisors (629113008).

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

255639888 is a wasteful number, since it uses less digits than its factorization.

255639888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165 (or 144 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 54.

The square root of 255639888 is about 15988.7425396746. The cubic root of 255639888 is about 634.6625507779.

The spelling of 255639888 in words is "two hundred fifty-five million, six hundred thirty-nine thousand, eight hundred eighty-eight".