2543644136 has 64 divisors (see below), whose sum is σ = 5336513280. Its totient is φ = 1126727680.

The previous prime is 2543644111. The next prime is 2543644163. The reversal of 2543644136 is 6314463452.

It is a self number, because there is not a number n which added to its sum of digits gives 2543644136.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1061756 + ... + 1064148.

It is an arithmetic number, because the mean of its divisors is an integer number (83383020).

Almost surely, 2^2543644136 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 2543644136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2668256640).

2543644136 is an abundant number, since it is smaller than the sum of its proper divisors (2792869144).

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

2543644136 is a wasteful number, since it uses less digits than its factorization.

2543644136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2714 (or 2710 counting only the distinct ones).

The product of its digits is 207360, while the sum is 38.

The square root of 2543644136 is about 50434.5529969286. The cubic root of 2543644136 is about 1365.0611834625.

The spelling of 2543644136 in words is "two billion, five hundred forty-three million, six hundred forty-four thousand, one hundred thirty-six".