257290 has 16 divisors (see below), whose sum is σ = 505440. Its totient is φ = 93520.

The previous prime is 257287. The next prime is 257293. The reversal of 257290 is 92752.

It is an interprime number because it is at equal distance from previous prime (257287) and next prime (257293).

It is not an unprimeable number, because it can be changed into a prime (257293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1060 + ... + 1279.

It is an arithmetic number, because the mean of its divisors is an integer number (31590).

2²⁵⁷²⁹⁰ is an apocalyptic number.

257290 is a deficient number, since it is larger than the sum of its proper divisors (248150).

257290 is a wasteful number, since it uses less digits than its factorization.

257290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 257290 is about 507.2376169016. The cubic root of 257290 is about 63.6025169422.

It can be divided in two parts, 2572 and 90, that added together give a palindrome (2662).

The spelling of 257290 in words is "two hundred fifty-seven thousand, two hundred ninety".