2561436 has 48 divisors (see below), whose sum is σ = 6830880. Its totient is φ = 829440.

The previous prime is 2561431. The next prime is 2561491. The reversal of 2561436 is 6341652.

2561436 is digitally balanced in base 2, 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 (27).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561431) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3676 + ... + 4316.

It is an arithmetic number, because the mean of its divisors is an integer number (142310).

2^2561436 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2561436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3415440).

2561436 is an abundant number, since it is smaller than the sum of its proper divisors (4269444).

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

2561436 is a wasteful number, since it uses less digits than its factorization.

2561436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691 (or 683 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 2561436 is about 1600.4486870875. The cubic root of 2561436 is about 136.8236493432.

The spelling of 2561436 in words is "two million, five hundred sixty-one thousand, four hundred thirty-six".