2561840262 has 96 divisors (see below), whose sum is σ = 6354223200. Its totient is φ = 740772864.

The previous prime is 2561840261. The next prime is 2561840297. The reversal of 2561840262 is 2620481652.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561840261) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 209164 + ... + 221072.

It is an arithmetic number, because the mean of its divisors is an integer number (66189825).

Almost surely, 2^2561840262 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2561840262, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3177111600).

2561840262 is an abundant number, since it is smaller than the sum of its proper divisors (3792382938).

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

2561840262 is a wasteful number, since it uses less digits than its factorization.

2561840262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11990 (or 11987 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 2561840262 is about 50614.6249813233. The cubic root of 2561840262 is about 1368.3084708859.

The spelling of 2561840262 in words is "two billion, five hundred sixty-one million, eight hundred forty thousand, two hundred sixty-two".