255688992 has 144 divisors (see below), whose sum is σ = 808674048. Its totient is φ = 76101120.

The previous prime is 255688967. The next prime is 255689009. The reversal of 255688992 is 299886552.

255688992 is a `hidden beast` number, since 2 + 556 + 8 + 89 + 9 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114963 + ... + 117165.

It is an arithmetic number, because the mean of its divisors is an integer number (5615792).

Almost surely, 2^255688992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255688992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (404337024).

255688992 is an abundant number, since it is smaller than the sum of its proper divisors (552985056).

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

255688992 is a wasteful number, since it uses less digits than its factorization.

255688992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263 (or 2252 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 54.

The square root of 255688992 is about 15990.2780463630. The cubic root of 255688992 is about 634.7031840753.

The spelling of 255688992 in words is "two hundred fifty-five million, six hundred eighty-eight thousand, nine hundred ninety-two".