639006952 has 8 divisors (see below), whose sum is σ = 1198138050. Its totient is φ = 319503472.

The previous prime is 639006947. The next prime is 639007001. The reversal of 639006952 is 259600936.

It can be written as a sum of positive squares in only one way, i.e., 614345796 + 24661156 = 24786^2 + 4966^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39937927 + ... + 39937942.

Almost surely, 2^639006952 is an apocalyptic number.

It is an amenable number.

639006952 is a deficient number, since it is larger than the sum of its proper divisors (559131098).

639006952 is a wasteful number, since it uses less digits than its factorization.

639006952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79875875 (or 79875871 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 40.

The square root of 639006952 is about 25278.5868275899. The cubic root of 639006952 is about 861.3279250609.

The spelling of 639006952 in words is "six hundred thirty-nine million, six thousand, nine hundred fifty-two".