6638812839 has 16 divisors (see below), whose sum is σ = 10044541440. Its totient is φ = 4331706840.

The previous prime is 6638812823. The next prime is 6638812883. The reversal of 6638812839 is 9382188366.

It is a happy number.

It is not a de Polignac number, because 6638812839 - 2⁴ = 6638812823 is a prime.

It is a super-2 number, since 2×6638812839² = 88147671822542479842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6638812889) 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, 2614497 + ... + 2617034.

It is an arithmetic number, because the mean of its divisors is an integer number (627783840).

Almost surely, 2^6638812839 is an apocalyptic number.

6638812839 is a deficient number, since it is larger than the sum of its proper divisors (3405728601).

6638812839 is a wasteful number, since it uses less digits than its factorization.

6638812839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5231587 (or 5231581 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The square root of 6638812839 is about 81478.9103940400. The cubic root of 6638812839 is about 1879.4472532807.

The spelling of 6638812839 in words is "six billion, six hundred thirty-eight million, eight hundred twelve thousand, eight hundred thirty-nine".