255717 has 40 divisors (see below), whose sum is σ = 487872. Its totient is φ = 129600.

The previous prime is 255713. The next prime is 255733. The reversal of 255717 is 717552.

It is not a de Polignac number, because 255717 - 2² = 255713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 255717.

It is not an unprimeable number, because it can be changed into a prime (255713) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6217 + ... + 6257.

2²⁵⁵⁷¹⁷ is an apocalyptic number.

255717 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

255717 is a deficient number, since it is larger than the sum of its proper divisors (232155).

255717 is a wasteful number, since it uses less digits than its factorization.

255717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71 (or 62 counting only the distinct ones).

The product of its digits is 2450, while the sum is 27.

The square root of 255717 is about 505.6846843637. The cubic root of 255717 is about 63.4726358216.

The spelling of 255717 in words is "two hundred fifty-five thousand, seven hundred seventeen".