639290568 has 192 divisors, whose sum is σ = 1966325760. Its totient is φ = 169610112.

The previous prime is 639290563. The next prime is 639290591. The reversal of 639290568 is 865092936.

It is not an unprimeable number, because it can be changed into a prime (639290563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5033721 + ... + 5033847.

It is an arithmetic number, because the mean of its divisors is an integer number (10241280).

Almost surely, 2^639290568 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 639290568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (983162880).

639290568 is an abundant number, since it is smaller than the sum of its proper divisors (1327035192).

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

639290568 is a wasteful number, since it uses less digits than its factorization.

639290568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 48.

The square root of 639290568 is about 25284.1960125292. The cubic root of 639290568 is about 861.4553364282.

The spelling of 639290568 in words is "six hundred thirty-nine million, two hundred ninety thousand, five hundred sixty-eight".