638867273564 has 24 divisors (see below), whose sum is σ = 1204078455888. Its totient is φ = 294847280640.

The previous prime is 638867273549. The next prime is 638867273587. The reversal of 638867273564 is 465372768836.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 638867273564.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 800204 + ... + 1384940.

It is an arithmetic number, because the mean of its divisors is an integer number (50169935662).

Almost surely, 2^638867273564 is an apocalyptic number.

It is an amenable number.

638867273564 is a deficient number, since it is larger than the sum of its proper divisors (565211182324).

638867273564 is a wasteful number, since it uses less digits than its factorization.

638867273564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605765 (or 605763 counting only the distinct ones).

The product of its digits is 243855360, while the sum is 65.

The spelling of 638867273564 in words is "six hundred thirty-eight billion, eight hundred sixty-seven million, two hundred seventy-three thousand, five hundred sixty-four".