257860 has 12 divisors (see below), whose sum is σ = 541548. Its totient is φ = 103136.

The previous prime is 257857. The next prime is 257861. The reversal of 257860 is 68752.

It can be written as a sum of positive squares in 2 ways, for example, as 123904 + 133956 = 352^2 + 366^2 .

It is not an unprimeable number, because it can be changed into a prime (257861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6427 + ... + 6466.

It is an arithmetic number, because the mean of its divisors is an integer number (45129).

2²⁵⁷⁸⁶⁰ is an apocalyptic number.

257860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257860 is an abundant number, since it is smaller than the sum of its proper divisors (283688).

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

257860 is a wasteful number, since it uses less digits than its factorization.

257860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12902 (or 12900 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 257860 is about 507.7991729020. The cubic root of 257860 is about 63.6494506170.

The spelling of 257860 in words is "two hundred fifty-seven thousand, eight hundred sixty".