638843068604 has 48 divisors (see below), whose sum is σ = 1213728582528. Its totient is φ = 292465079808.

The previous prime is 638843068573. The next prime is 638843068627. The reversal of 638843068604 is 406860348836.

It is a self number, because there is not a number n which added to its sum of digits gives 638843068604.

It is a congruent number.

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, 9062237 + ... + 9132459.

It is an arithmetic number, because the mean of its divisors is an integer number (25286012136).

Almost surely, 2^638843068604 is an apocalyptic number.

It is an amenable number.

638843068604 is a deficient number, since it is larger than the sum of its proper divisors (574885513924).

638843068604 is a wasteful number, since it uses less digits than its factorization.

638843068604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71654 (or 71652 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 56.

The spelling of 638843068604 in words is "six hundred thirty-eight billion, eight hundred forty-three million, sixty-eight thousand, six hundred four".