638407365244 has 24 divisors (see below), whose sum is σ = 1218807273600. Its totient is φ = 290178124080.

The previous prime is 638407365223. The next prime is 638407365251. The reversal of 638407365244 is 442563704836.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 638407365191 and 638407365200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1944777 + ... + 2249215.

It is an arithmetic number, because the mean of its divisors is an integer number (50783636400).

Almost surely, 2^638407365244 is an apocalyptic number.

It is an amenable number.

638407365244 is a deficient number, since it is larger than the sum of its proper divisors (580399908356).

638407365244 is a wasteful number, since it uses less digits than its factorization.

638407365244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352113 (or 352111 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 52.

The spelling of 638407365244 in words is "six hundred thirty-eight billion, four hundred seven million, three hundred sixty-five thousand, two hundred forty-four".