2543725638 has 12 divisors (see below), whose sum is σ = 5511405588. Its totient is φ = 847908540.

The previous prime is 2543725637. The next prime is 2543725663. The reversal of 2543725638 is 8365273452.

2543725638 is a `hidden beast` number, since 2 + 5 + 4 + 3 + 7 + 2 + 5 + 638 = 666.

2543725638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2543725593 and 2543725602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2543725637) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70659028 + ... + 70659063.

It is an arithmetic number, because the mean of its divisors is an integer number (459283799).

Almost surely, 2^2543725638 is an apocalyptic number.

2543725638 is an abundant number, since it is smaller than the sum of its proper divisors (2967679950).

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

2543725638 is a wasteful number, since it uses less digits than its factorization.

2543725638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141318099 (or 141318096 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 45.

The square root of 2543725638 is about 50435.3609881004. The cubic root of 2543725638 is about 1365.0757628117.

The spelling of 2543725638 in words is "two billion, five hundred forty-three million, seven hundred twenty-five thousand, six hundred thirty-eight".