638841144004 has 24 divisors (see below), whose sum is σ = 1295184789248. Its totient is φ = 270038525760.

The previous prime is 638841144001. The next prime is 638841144037. The reversal of 638841144004 is 400441148836.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (638841144001) 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, 156270252 + ... + 156274339.

Almost surely, 2^638841144004 is an apocalyptic number.

It is an amenable number.

638841144004 is an abundant number, since it is smaller than the sum of its proper divisors (656343645244).

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

638841144004 is a wasteful number, since it uses less digits than its factorization.

638841144004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312544675 (or 312544673 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 43.

The spelling of 638841144004 in words is "six hundred thirty-eight billion, eight hundred forty-one million, one hundred forty-four thousand, four".