639063936 has 384 divisors, whose sum is σ = 2287084800. Its totient is φ = 167215104.

The previous prime is 639063913. The next prime is 639063941. The reversal of 639063936 is 639360936.

639063936 is a `hidden beast` number, since 6 + 3 + 9 + 0 + 639 + 3 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 639063891 and 639063900.

It is a congruent number.

It is an unprimeable number.

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, 6588240 + ... + 6588336.

It is an arithmetic number, because the mean of its divisors is an integer number (5955950).

Almost surely, 2^639063936 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 639063936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1143542400).

639063936 is an abundant number, since it is smaller than the sum of its proper divisors (1648020864).

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

639063936 is a wasteful number, since it uses less digits than its factorization.

639063936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 45.

The square root of 639063936 is about 25279.7139224320. The cubic root of 639063936 is about 861.3535275218.

The spelling of 639063936 in words is "six hundred thirty-nine million, sixty-three thousand, nine hundred thirty-six".