261290244 has 12 divisors (see below), whose sum is σ = 609677264. Its totient is φ = 87096744.

The previous prime is 261290213. The next prime is 261290257. The reversal of 261290244 is 442092162.

261290244 is digitally balanced in base 2, 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, 10887082 + ... + 10887105.

Almost surely, 2^261290244 is an apocalyptic number.

It is an amenable number.

261290244 is an abundant number, since it is smaller than the sum of its proper divisors (348387020).

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

261290244 is a wasteful number, since it uses less digits than its factorization.

261290244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21774194 (or 21774192 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 261290244 is about 16164.4747517511. The cubic root of 261290244 is about 639.3044559538.

The spelling of 261290244 in words is "two hundred sixty-one million, two hundred ninety thousand, two hundred forty-four".