257690 has 16 divisors (see below), whose sum is σ = 471528. Its totient is φ = 101376.

The previous prime is 257689. The next prime is 257707. The reversal of 257690 is 96752.

257690 = 141² + 142² + ... + 152².

It can be written as a sum of positive squares in 4 ways, for example, as 203401 + 54289 = 451^2 + 233^2 .

It is a super-2 number, since 2×257690² = 132808272200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 554 + ... + 906.

2²⁵⁷⁶⁹⁰ is an apocalyptic number.

257690 is a deficient number, since it is larger than the sum of its proper divisors (213838).

257690 is a wasteful number, since it uses less digits than its factorization.

257690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 257690 is about 507.6317562958. The cubic root of 257690 is about 63.6354600985.

The spelling of 257690 in words is "two hundred fifty-seven thousand, six hundred ninety".