638632441232 has 20 divisors (see below), whose sum is σ = 1237370791296. Its totient is φ = 319310946720.

The previous prime is 638632441219. The next prime is 638632441243. The reversal of 638632441232 is 232144236836.

It is a happy number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 783257 + ... + 1375047.

Almost surely, 2^638632441232 is an apocalyptic number.

It is an amenable number.

638632441232 is a deficient number, since it is larger than the sum of its proper divisors (598738350064).

638632441232 is a wasteful number, since it uses less digits than its factorization.

638632441232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659246 (or 659240 counting only the distinct ones).

The product of its digits is 995328, while the sum is 44.

The spelling of 638632441232 in words is "six hundred thirty-eight billion, six hundred thirty-two million, four hundred forty-one thousand, two hundred thirty-two".