639727273064 has 16 divisors (see below), whose sum is σ = 1308533058720. Its totient is φ = 290785124080.

The previous prime is 639727273001. The next prime is 639727273067. The reversal of 639727273064 is 460372727936.

It is not an unprimeable number, because it can be changed into a prime (639727273067) 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 3 ways as a sum of consecutive naturals, for example, 3634813964 + ... + 3634814139.

It is an arithmetic number, because the mean of its divisors is an integer number (81783316170).

Almost surely, 2^639727273064 is an apocalyptic number.

It is an amenable number.

639727273064 is an abundant number, since it is smaller than the sum of its proper divisors (668805785656).

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

639727273064 is a wasteful number, since it uses less digits than its factorization.

639727273064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7269628120 (or 7269628116 counting only the distinct ones).

The product of its (nonzero) digits is 16003008, while the sum is 56.

The spelling of 639727273064 in words is "six hundred thirty-nine billion, seven hundred twenty-seven million, two hundred seventy-three thousand, sixty-four".