256706 has 8 divisors (see below), whose sum is σ = 395580. Its totient is φ = 124848.

The previous prime is 256699. The next prime is 256721. The reversal of 256706 is 607652.

256706 is nontrivially palindromic in base 13.

It can be written as a sum of positive squares in 2 ways, for example, as 255025 + 1681 = 505^2 + 41^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1661 + ... + 1808.

2²⁵⁶⁷⁰⁶ is an apocalyptic number.

256706 is a deficient number, since it is larger than the sum of its proper divisors (138874).

256706 is a wasteful number, since it uses less digits than its factorization.

256706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3508.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 256706 is about 506.6616227819. The cubic root of 256706 is about 63.5543585624.

The spelling of 256706 in words is "two hundred fifty-six thousand, seven hundred six".