639915950 has 24 divisors (see below), whose sum is σ = 1228641600. Its totient is φ = 247708800.

The previous prime is 639915937. The next prime is 639915967. The reversal of 639915950 is 59519936.

639915950 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 639915895 and 639915904.

It is a congruent number.

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, 204875 + ... + 207974.

It is an arithmetic number, because the mean of its divisors is an integer number (51193400).

Almost surely, 2^639915950 is an apocalyptic number.

639915950 is a deficient number, since it is larger than the sum of its proper divisors (588725650).

639915950 is a wasteful number, since it uses less digits than its factorization.

639915950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412892 (or 412887 counting only the distinct ones).

The product of its (nonzero) digits is 328050, while the sum is 47.

The square root of 639915950 is about 25296.5600428201. The cubic root of 639915950 is about 861.7361493121.

The spelling of 639915950 in words is "six hundred thirty-nine million, nine hundred fifteen thousand, nine hundred fifty".