256667235 has 64 divisors (see below), whose sum is σ = 477757440. Its totient is φ = 116420480.

The previous prime is 256667227. The next prime is 256667239. The reversal of 256667235 is 532766652.

It is not a de Polignac number, because 256667235 - 2³ = 256667227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256667239) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 177646 + ... + 179084.

It is an arithmetic number, because the mean of its divisors is an integer number (7464960).

Almost surely, 2^256667235 is an apocalyptic number.

256667235 is a deficient number, since it is larger than the sum of its proper divisors (221090205).

256667235 is a wasteful number, since it uses less digits than its factorization.

256667235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528.

The product of its digits is 453600, while the sum is 42.

The square root of 256667235 is about 16020.8375249236. The cubic root of 256667235 is about 635.5115930108.

The spelling of 256667235 in words is "two hundred fifty-six million, six hundred sixty-seven thousand, two hundred thirty-five".