256808238 has 16 divisors (see below), whose sum is σ = 522322560. Its totient is φ = 84151736.

The previous prime is 256808219. The next prime is 256808243. The reversal of 256808238 is 832808652.

It is a super-2 number, since 2×256808238² = 131900942209329288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 256808238.

It is a congruent 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, 362370 + ... + 363077.

It is an arithmetic number, because the mean of its divisors is an integer number (32645160).

Almost surely, 2^256808238 is an apocalyptic number.

256808238 is an abundant number, since it is smaller than the sum of its proper divisors (265514322).

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

256808238 is a wasteful number, since it uses less digits than its factorization.

256808238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725511.

The product of its (nonzero) digits is 184320, while the sum is 42.

The square root of 256808238 is about 16025.2375333410. The cubic root of 256808238 is about 635.6279468271.

The spelling of 256808238 in words is "two hundred fifty-six million, eight hundred eight thousand, two hundred thirty-eight".