638822052768 has 96 divisors (see below), whose sum is σ = 1702988292096. Its totient is φ = 209632819968.

The previous prime is 638822052761. The next prime is 638822052773. The reversal of 638822052768 is 867250228836.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (638822052761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10666555 + ... + 10726277.

It is an arithmetic number, because the mean of its divisors is an integer number (17739461376).

Almost surely, 2^638822052768 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 638822052768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (851494146048).

638822052768 is an abundant number, since it is smaller than the sum of its proper divisors (1064166239328).

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

638822052768 is a wasteful number, since it uses less digits than its factorization.

638822052768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61466 (or 61458 counting only the distinct ones).

The product of its (nonzero) digits is 15482880, while the sum is 57.

The spelling of 638822052768 in words is "six hundred thirty-eight billion, eight hundred twenty-two million, fifty-two thousand, seven hundred sixty-eight".