261245256 has 32 divisors (see below), whose sum is σ = 691532640. Its totient is φ = 81959168.

The previous prime is 261245233. The next prime is 261245267. The reversal of 261245256 is 652542162.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

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, 319746 + ... + 320561.

It is an arithmetic number, because the mean of its divisors is an integer number (21610395).

Almost surely, 2^261245256 is an apocalyptic number.

It is an amenable number.

261245256 is an abundant number, since it is smaller than the sum of its proper divisors (430287384).

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

261245256 is a wasteful number, since it uses less digits than its factorization.

261245256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640333 (or 640329 counting only the distinct ones).

The product of its digits is 28800, while the sum is 33.

The square root of 261245256 is about 16163.0831217314. The cubic root of 261245256 is about 639.2677628123.

The spelling of 261245256 in words is "two hundred sixty-one million, two hundred forty-five thousand, two hundred fifty-six".