639240050 has 24 divisors (see below), whose sum is σ = 1190655936. Its totient is φ = 255337040.

The previous prime is 639240013. The next prime is 639240059. The reversal of 639240050 is 50042936.

It is a junction number, because it is equal to n+sod(n) for n = 639239995 and 639240022.

It is not an unprimeable number, because it can be changed into a prime (639240059) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 28547 + ... + 45753.

It is an arithmetic number, because the mean of its divisors is an integer number (49610664).

Almost surely, 2^639240050 is an apocalyptic number.

639240050 is a deficient number, since it is larger than the sum of its proper divisors (551415886).

639240050 is a wasteful number, since it uses less digits than its factorization.

639240050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17962 (or 17957 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 639240050 is about 25283.1969893050. The cubic root of 639240050 is about 861.4326445313.

Adding to 639240050 its reverse (50042936), we get a palindrome (689282986).

The spelling of 639240050 in words is "six hundred thirty-nine million, two hundred forty thousand, fifty".