638674788048 has 80 divisors (see below), whose sum is σ = 1801619064000. Its totient is φ = 193353149440.

The previous prime is 638674788029. The next prime is 638674788119. The reversal of 638674788048 is 840887476836.

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, 22683 + ... + 1130426.

It is an arithmetic number, because the mean of its divisors is an integer number (22520238300).

Almost surely, 2^638674788048 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638674788048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (900809532000).

638674788048 is an abundant number, since it is smaller than the sum of its proper divisors (1162944275952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638674788048 is a wasteful number, since it uses less digits than its factorization.

638674788048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154180 (or 1154174 counting only the distinct ones).

The product of its (nonzero) digits is 346816512, while the sum is 69.

The spelling of 638674788048 in words is "six hundred thirty-eight billion, six hundred seventy-four million, seven hundred eighty-eight thousand, forty-eight".