638338754284 has 144 divisors (see below), whose sum is σ = 1441603215360. Its totient is φ = 244520640000.

The previous prime is 638338754243. The next prime is 638338754303. The reversal of 638338754284 is 482457833836.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 41040309 + ... + 41055859.

It is an arithmetic number, because the mean of its divisors is an integer number (10011133440).

Almost surely, 2^638338754284 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 638338754284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (720801607680).

638338754284 is an abundant number, since it is smaller than the sum of its proper divisors (803264461076).

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

638338754284 is a wasteful number, since it uses less digits than its factorization.

638338754284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15900 (or 15891 counting only the distinct ones).

The product of its digits is 92897280, while the sum is 61.

The spelling of 638338754284 in words is "six hundred thirty-eight billion, three hundred thirty-eight million, seven hundred fifty-four thousand, two hundred eighty-four".