639258324079488 has 128 divisors (see below), whose sum is σ = 1787436427488000. Its totient is φ = 201866926436352.

The previous prime is 639258324079429. The next prime is 639258324079489. The reversal of 639258324079488 is 884970423852936.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639258324079489) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 366680973 + ... + 368420211.

It is an arithmetic number, because the mean of its divisors is an integer number (13964347089750).

Almost surely, 2^{639258324079488} is an apocalyptic number.

It is an amenable number.

639258324079488 is an abundant number, since it is smaller than the sum of its proper divisors (1148178103408512).

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

639258324079488 is a wasteful number, since it uses less digits than its factorization.

639258324079488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789652 (or 1789640 counting only the distinct ones).

The product of its (nonzero) digits is 5016453120, while the sum is 78.

The spelling of 639258324079488 in words is "six hundred thirty-nine trillion, two hundred fifty-eight billion, three hundred twenty-four million, seventy-nine thousand, four hundred eighty-eight".