261222756 has 12 divisors (see below), whose sum is σ = 609519792. Its totient is φ = 87074248.

The previous prime is 261222739. The next prime is 261222761. The reversal of 261222756 is 657222162.

261222756 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10884270 + ... + 10884293.

It is an arithmetic number, because the mean of its divisors is an integer number (50793316).

Almost surely, 2^261222756 is an apocalyptic number.

It is an amenable number.

261222756 is an abundant number, since it is smaller than the sum of its proper divisors (348297036).

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

261222756 is a wasteful number, since it uses less digits than its factorization.

261222756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21768570 (or 21768568 counting only the distinct ones).

The product of its digits is 20160, while the sum is 33.

The square root of 261222756 is about 16162.3870761716. The cubic root of 261222756 is about 639.2494097675.

The spelling of 261222756 in words is "two hundred sixty-one million, two hundred twenty-two thousand, seven hundred fifty-six".