257755 has 4 divisors (see below), whose sum is σ = 309312. Its totient is φ = 206200.

The previous prime is 257731. The next prime is 257783. The reversal of 257755 is 557752.

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

It is not a de Polignac number, because 257755 - 2⁷ = 257627 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25771 + ... + 25780.

It is an arithmetic number, because the mean of its divisors is an integer number (77328).

2²⁵⁷⁷⁵⁵ is an apocalyptic number.

257755 is a deficient number, since it is larger than the sum of its proper divisors (51557).

257755 is an equidigital number, since it uses as much as digits as its factorization.

257755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51556.

The product of its digits is 12250, while the sum is 31.

The square root of 257755 is about 507.6957750464. The cubic root of 257755 is about 63.6408101408.

The spelling of 257755 in words is "two hundred fifty-seven thousand, seven hundred fifty-five".