2638773844 has 48 divisors (see below), whose sum is σ = 5451884928. Its totient is φ = 1093903488.

The previous prime is 2638773833. The next prime is 2638773857. The reversal of 2638773844 is 4483778362.

2638773844 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 2638773791 and 2638773800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171867 + ... + 186589.

It is an arithmetic number, because the mean of its divisors is an integer number (113580936).

Almost surely, 2^2638773844 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 2638773844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2725942464).

2638773844 is an abundant number, since it is smaller than the sum of its proper divisors (2813111084).

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

2638773844 is a wasteful number, since it uses less digits than its factorization.

2638773844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14944 (or 14942 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 52.

The square root of 2638773844 is about 51368.9969144814. The cubic root of 2638773844 is about 1381.8706417332.

The spelling of 2638773844 in words is "two billion, six hundred thirty-eight million, seven hundred seventy-three thousand, eight hundred forty-four".