638844703732 has 12 divisors (see below), whose sum is σ = 1166585980896. Its totient is φ = 305534423480.

The previous prime is 638844703667. The next prime is 638844703733. The reversal of 638844703732 is 237307448836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638844703733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3471981994 + ... + 3471982177.

It is an arithmetic number, because the mean of its divisors is an integer number (97215498408).

Almost surely, 2^638844703732 is an apocalyptic number.

It is an amenable number.

638844703732 is a deficient number, since it is larger than the sum of its proper divisors (527741277164).

638844703732 is a wasteful number, since it uses less digits than its factorization.

638844703732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6943964198 (or 6943964196 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 55.

The spelling of 638844703732 in words is "six hundred thirty-eight billion, eight hundred forty-four million, seven hundred three thousand, seven hundred thirty-two".