638820227368 has 64 divisors (see below), whose sum is σ = 1216835424000. Its totient is φ = 314358700032.

The previous prime is 638820227347. The next prime is 638820227401. The reversal of 638820227368 is 863722028836.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 397028548 + ... + 397030156.

It is an arithmetic number, because the mean of its divisors is an integer number (19013053500).

Almost surely, 2^638820227368 is an apocalyptic number.

It is an amenable number.

638820227368 is a deficient number, since it is larger than the sum of its proper divisors (578015196632).

638820227368 is a wasteful number, since it uses less digits than its factorization.

638820227368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3314 (or 3310 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 55.

The spelling of 638820227368 in words is "six hundred thirty-eight billion, eight hundred twenty million, two hundred twenty-seven thousand, three hundred sixty-eight".