638844867006 has 16 divisors (see below), whose sum is σ = 1277709721344. Its totient is φ = 212944957784.

The previous prime is 638844866999. The next prime is 638844867079. The reversal of 638844867006 is 600768448836.

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, 399990 + ... + 1199033.

It is an arithmetic number, because the mean of its divisors is an integer number (79856857584).

Almost surely, 2^638844867006 is an apocalyptic number.

638844867006 is an abundant number, since it is smaller than the sum of its proper divisors (638864854338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638844867006 is a wasteful number, since it uses less digits than its factorization.

638844867006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665615.

The product of its (nonzero) digits is 37158912, while the sum is 60.

The spelling of 638844867006 in words is "six hundred thirty-eight billion, eight hundred forty-four million, eight hundred sixty-seven thousand, six".