255787 has 4 divisors (see below), whose sum is σ = 292336. Its totient is φ = 219240.

The previous prime is 255767. The next prime is 255803. The reversal of 255787 is 787552.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 255787 - 2⁷ = 255659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18264 + ... + 18277.

It is an arithmetic number, because the mean of its divisors is an integer number (73084).

2²⁵⁵⁷⁸⁷ is an apocalyptic number.

255787 is a deficient number, since it is larger than the sum of its proper divisors (36549).

255787 is an equidigital number, since it uses as much as digits as its factorization.

255787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36548.

The product of its digits is 19600, while the sum is 34.

The square root of 255787 is about 505.7538927186. The cubic root of 255787 is about 63.4784269620.

The spelling of 255787 in words is "two hundred fifty-five thousand, seven hundred eighty-seven".