639949752 has 96 divisors (see below), whose sum is σ = 1872015600. Its totient is φ = 196328448.

The previous prime is 639949729. The next prime is 639949777. The reversal of 639949752 is 257949936.

639949752 is a `hidden beast` number, since 63 + 99 + 497 + 5 + 2 = 666.

639949752 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 404499 + ... + 406077.

Almost surely, 2^639949752 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 639949752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (936007800).

639949752 is an abundant number, since it is smaller than the sum of its proper divisors (1232065848).

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

639949752 is a wasteful number, since it uses less digits than its factorization.

639949752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2037 (or 2030 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 54.

The square root of 639949752 is about 25297.2281485541. The cubic root of 639949752 is about 861.7513220820.

The spelling of 639949752 in words is "six hundred thirty-nine million, nine hundred forty-nine thousand, seven hundred fifty-two".