638339008 has 28 divisors (see below), whose sum is σ = 1273291840. Its totient is φ = 317509632.

The previous prime is 638338993. The next prime is 638339041. The reversal of 638339008 is 800933836.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13488 + ... + 38191.

Almost surely, 2^638339008 is an apocalyptic number.

It is an amenable number.

638339008 is a deficient number, since it is larger than the sum of its proper divisors (634952832).

638339008 is a wasteful number, since it uses less digits than its factorization.

638339008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51884 (or 51874 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 638339008 is about 25265.3717170359. The cubic root of 638339008 is about 861.0277095512.

The spelling of 638339008 in words is "six hundred thirty-eight million, three hundred thirty-nine thousand, eight".