257278 has 32 divisors (see below), whose sum is σ = 497664. Its totient is φ = 97152.

The previous prime is 257273. The next prime is 257281. The reversal of 257278 is 872752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257273) by changing a digit.

257278 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5451 + ... + 5497.

It is an arithmetic number, because the mean of its divisors is an integer number (15552).

2²⁵⁷²⁷⁸ is an apocalyptic number.

257278 is a deficient number, since it is larger than the sum of its proper divisors (240386).

257278 is a wasteful number, since it uses less digits than its factorization.

257278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96.

The product of its digits is 7840, while the sum is 31.

The square root of 257278 is about 507.2257879880. The cubic root of 257278 is about 63.6015281201.

It can be divided in two parts, 257 and 278, that added together give a palindrome (535).

The spelling of 257278 in words is "two hundred fifty-seven thousand, two hundred seventy-eight".