261208256 has 42 divisors (see below), whose sum is σ = 524705580. Its totient is φ = 129014400.

The previous prime is 261208243. The next prime is 261208267. The reversal of 261208256 is 652802162.

261208256 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1459175 + ... + 1459353.

It is an arithmetic number, because the mean of its divisors is an integer number (12492990).

Almost surely, 2^261208256 is an apocalyptic number.

It is an amenable number.

261208256 is an abundant number, since it is smaller than the sum of its proper divisors (263497324).

261208256 is an equidigital number, since it uses as much as digits as its factorization.

261208256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493 (or 332 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 261208256 is about 16161.9384975937. The cubic root of 261208256 is about 639.2375816914.

The spelling of 261208256 in words is "two hundred sixty-one million, two hundred eight thousand, two hundred fifty-six".