639888113829384 has 96 divisors (see below), whose sum is σ = 2066719373896320. Its totient is φ = 174876254707968.

The previous prime is 639888113829379. The next prime is 639888113829401. The reversal of 639888113829384 is 483928311888936.

639888113829384 is a `hidden beast` number, since 6 + 3 + 9 + 8 + 8 + 81 + 138 + 29 + 384 = 666.

It is a super-2 number, since 2×639888113829384² (a number of 30 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

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 23 ways as a sum of consecutive naturals, for example, 27600407397 + ... + 27600430580.

It is an arithmetic number, because the mean of its divisors is an integer number (21528326811420).

Almost surely, 2^{639888113829384} is an apocalyptic number.

It is an amenable number.

639888113829384 is an abundant number, since it is smaller than the sum of its proper divisors (1426831260066936).

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

639888113829384 is a wasteful number, since it uses less digits than its factorization.

639888113829384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55200838019 (or 55200838012 counting only the distinct ones).

The product of its digits is 3439853568, while the sum is 81.

The spelling of 639888113829384 in words is "six hundred thirty-nine trillion, eight hundred eighty-eight billion, one hundred thirteen million, eight hundred twenty-nine thousand, three hundred eighty-four".