257870 has 16 divisors (see below), whose sum is σ = 470448. Its totient is φ = 101760.

The previous prime is 257869. The next prime is 257879. The reversal of 257870 is 78752.

257870 is nontrivially palindromic in base 15.

257870 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

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 257870.

It is not an unprimeable number, because it can be changed into a prime (257879) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 950 + ... + 1190.

It is an arithmetic number, because the mean of its divisors is an integer number (29403).

2²⁵⁷⁸⁷⁰ is an apocalyptic number.

257870 is a deficient number, since it is larger than the sum of its proper divisors (212578).

257870 is a wasteful number, since it uses less digits than its factorization.

257870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 257870 is about 507.8090192188. The cubic root of 257870 is about 63.6502733972.

The spelling of 257870 in words is "two hundred fifty-seven thousand, eight hundred seventy".