639345168 has 360 divisors, whose sum is σ = 2353391040. Its totient is φ = 157386240.

The previous prime is 639345167. The next prime is 639345173. The reversal of 639345168 is 861543936.

639345168 is a `hidden beast` number, since 639 + 3 + 4 + 5 + 1 + 6 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639345167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 5865498 + ... + 5865606.

Almost surely, 2^639345168 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 639345168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1176695520).

639345168 is an abundant number, since it is smaller than the sum of its proper divisors (1714045872).

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

639345168 is a wasteful number, since it uses less digits than its factorization.

639345168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187 (or 155 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 639345168 is about 25285.2757153249. The cubic root of 639345168 is about 861.4798605517.

The spelling of 639345168 in words is "six hundred thirty-nine million, three hundred forty-five thousand, one hundred sixty-eight".