2638888889 has 16 divisors (see below), whose sum is σ = 3266656512. Its totient is φ = 2075830848.

The previous prime is 2638888873. The next prime is 2638888909. The reversal of 2638888889 is 9888888362.

It is not a de Polignac number, because 2638888889 - 2⁴ = 2638888873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2638488889) by changing a digit.

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, 68069 + ... + 99554.

It is an arithmetic number, because the mean of its divisors is an integer number (204166032).

Almost surely, 2^2638888889 is an apocalyptic number.

It is an amenable number.

2638888889 is a deficient number, since it is larger than the sum of its proper divisors (627767623).

2638888889 is a wasteful number, since it uses less digits than its factorization.

2638888889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167816.

The product of its digits is 84934656, while the sum is 68.

The square root of 2638888889 is about 51370.1166924896. The cubic root of 2638888889 is about 1381.8907236610.

The spelling of 2638888889 in words is "two billion, six hundred thirty-eight million, eight hundred eighty-eight thousand, eight hundred eighty-nine".