638819086204 has 24 divisors (see below), whose sum is σ = 1203959374128. Its totient is φ = 294831962880.

The previous prime is 638819086153. The next prime is 638819086229. The reversal of 638819086204 is 402680918836.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2211039 + ... + 2483209.

It is an arithmetic number, because the mean of its divisors is an integer number (50164973922).

Almost surely, 2^638819086204 is an apocalyptic number.

It is an amenable number.

638819086204 is a deficient number, since it is larger than the sum of its proper divisors (565140287924).

638819086204 is a wasteful number, since it uses less digits than its factorization.

638819086204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317325 (or 317323 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 55.

The spelling of 638819086204 in words is "six hundred thirty-eight billion, eight hundred nineteen million, eighty-six thousand, two hundred four".