2561844 has 36 divisors (see below), whose sum is σ = 6175232. Its totient is φ = 826560.

The previous prime is 2561833. The next prime is 2561857. The reversal of 2561844 is 4481652.

2561844 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

2561844 is a Rhonda number in base 8.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20109 + ... + 20235.

2^2561844 is an apocalyptic number.

It is an amenable number.

2561844 is an abundant number, since it is smaller than the sum of its proper divisors (3613388).

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

2561844 is a wasteful number, since it uses less digits than its factorization.

2561844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216 (or 173 counting only the distinct ones).

The product of its digits is 7680, while the sum is 30.

The square root of 2561844 is about 1600.5761462673. The cubic root of 2561844 is about 136.8309136389.

The spelling of 2561844 in words is "two million, five hundred sixty-one thousand, eight hundred forty-four".