639989350 has 192 divisors, whose sum is σ = 1684892160. Its totient is φ = 174182400.

The previous prime is 639989341. The next prime is 639989401. The reversal of 639989350 is 53989936.

It is a happy number.

639989350 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×639989350² = 819172736226845000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 950614 + ... + 951286.

It is an arithmetic number, because the mean of its divisors is an integer number (8775480).

Almost surely, 2^639989350 is an apocalyptic number.

639989350 is an abundant number, since it is smaller than the sum of its proper divisors (1044902810).

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

639989350 is a wasteful number, since it uses less digits than its factorization.

639989350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735 (or 730 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 52.

The square root of 639989350 is about 25298.0107913646. The cubic root of 639989350 is about 861.7690958343.

It can be divided in two parts, 639 and 989350, that added together give a palindrome (989989).

The spelling of 639989350 in words is "six hundred thirty-nine million, nine hundred eighty-nine thousand, three hundred fifty".