638632444244 has 48 divisors (see below), whose sum is σ = 1163340541440. Its totient is φ = 306509115360.

The previous prime is 638632444243. The next prime is 638632444301. The reversal of 638632444244 is 442444236836.

It is a junction number, because it is equal to n+sod(n) for n = 638632444192 and 638632444201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638632444243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41507777 + ... + 41523159.

It is an arithmetic number, because the mean of its divisors is an integer number (24236261280).

Almost surely, 2^638632444244 is an apocalyptic number.

It is an amenable number.

638632444244 is a deficient number, since it is larger than the sum of its proper divisors (524708097196).

638632444244 is a wasteful number, since it uses less digits than its factorization.

638632444244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19580 (or 19578 counting only the distinct ones).

The product of its digits is 10616832, while the sum is 50.

The spelling of 638632444244 in words is "six hundred thirty-eight billion, six hundred thirty-two million, four hundred forty-four thousand, two hundred forty-four".