2543791638 has 8 divisors (see below), whose sum is σ = 5087583288. Its totient is φ = 847930544.

The previous prime is 2543791633. The next prime is 2543791639. The reversal of 2543791638 is 8361973452.

It is a sphenic number, since it is the product of 3 distinct primes.

2543791638 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2543791631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211982631 + ... + 211982642.

It is an arithmetic number, because the mean of its divisors is an integer number (635947911).

Almost surely, 2^2543791638 is an apocalyptic number.

2543791638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2543791638 is a wasteful number, since it uses less digits than its factorization.

2543791638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423965278.

The product of its digits is 1088640, while the sum is 48.

The square root of 2543791638 is about 50436.0152866977. The cubic root of 2543791638 is about 1365.0875688833.

The spelling of 2543791638 in words is "two billion, five hundred forty-three million, seven hundred ninety-one thousand, six hundred thirty-eight".