639040650 has 24 divisors (see below), whose sum is σ = 1584821184. Its totient is φ = 170410800.

The previous prime is 639040627. The next prime is 639040667. The reversal of 639040650 is 56040936.

It is a happy number.

639040650 is digitally balanced in base 2 and base 6, because in such bases it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×639040650³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2129986 + ... + 2130285.

It is an arithmetic number, because the mean of its divisors is an integer number (66034216).

Almost surely, 2^639040650 is an apocalyptic number.

639040650 is an abundant number, since it is smaller than the sum of its proper divisors (945780534).

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

639040650 is a wasteful number, since it uses less digits than its factorization.

639040650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4260286 (or 4260281 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 639040650 is about 25279.2533513156. The cubic root of 639040650 is about 861.3430654899.

The spelling of 639040650 in words is "six hundred thirty-nine million, forty thousand, six hundred fifty".