261670256 has 40 divisors (see below), whose sum is σ = 554143104. Its totient is φ = 119162880.

The previous prime is 261670247. The next prime is 261670259. The reversal of 261670256 is 652076162.

261670256 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261670259) 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, 7085 + ... + 23948.

Almost surely, 2^261670256 is an apocalyptic number.

It is an amenable number.

261670256 is an abundant number, since it is smaller than the sum of its proper divisors (292472848).

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

261670256 is a wasteful number, since it uses less digits than its factorization.

261670256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31089 (or 31083 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 261670256 is about 16176.2250231629. The cubic root of 261670256 is about 639.6142336681.

The spelling of 261670256 in words is "two hundred sixty-one million, six hundred seventy thousand, two hundred fifty-six".