639835052 has 12 divisors (see below), whose sum is σ = 1185576840. Its totient is φ = 301098816.

The previous prime is 639835003. The next prime is 639835057. The reversal of 639835052 is 250538936.

It is not an unprimeable number, because it can be changed into a prime (639835057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4704602 + ... + 4704737.

It is an arithmetic number, because the mean of its divisors is an integer number (98798070).

Almost surely, 2^639835052 is an apocalyptic number.

It is an amenable number.

639835052 is a deficient number, since it is larger than the sum of its proper divisors (545741788).

639835052 is a wasteful number, since it uses less digits than its factorization.

639835052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9409360 (or 9409358 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 639835052 is about 25294.9610001676. The cubic root of 639835052 is about 861.6998342987.

The spelling of 639835052 in words is "six hundred thirty-nine million, eight hundred thirty-five thousand, fifty-two".