638005318790 has 48 divisors (see below), whose sum is σ = 1342236535344. Its totient is φ = 217707940800.

The previous prime is 638005318711. The next prime is 638005318813. The reversal of 638005318790 is 97813500836.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2982041 + ... + 3188820.

It is an arithmetic number, because the mean of its divisors is an integer number (27963261153).

Almost surely, 2^638005318790 is an apocalyptic number.

638005318790 is an abundant number, since it is smaller than the sum of its proper divisors (704231216554).

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

638005318790 is a wasteful number, since it uses less digits than its factorization.

638005318790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6171093 (or 6171086 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 638005318790 in words is "six hundred thirty-eight billion, five million, three hundred eighteen thousand, seven hundred ninety".