638587073873 has 8 divisors (see below), whose sum is σ = 731057097792. Its totient is φ = 546427874736.

The previous prime is 638587073863. The next prime is 638587073903. The reversal of 638587073873 is 378370785836.

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

It is a cyclic number.

It is not a de Polignac number, because 638587073873 - 2¹⁸ = 638586811729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638587073843) 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 7 ways as a sum of consecutive naturals, for example, 77701790 + ... + 77710007.

It is an arithmetic number, because the mean of its divisors is an integer number (91382137224).

Almost surely, 2^638587073873 is an apocalyptic number.

It is an amenable number.

638587073873 is a deficient number, since it is larger than the sum of its proper divisors (92470023919).

638587073873 is a wasteful number, since it uses less digits than its factorization.

638587073873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155412391.

The product of its (nonzero) digits is 142248960, while the sum is 65.

The spelling of 638587073873 in words is "six hundred thirty-eight billion, five hundred eighty-seven million, seventy-three thousand, eight hundred seventy-three".