638448604 has 12 divisors (see below), whose sum is σ = 1118043864. Its totient is φ = 319007504.

The previous prime is 638448571. The next prime is 638448607. The reversal of 638448604 is 406844836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638448607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47482 + ... + 59425.

It is an arithmetic number, because the mean of its divisors is an integer number (93170322).

Almost surely, 2^638448604 is an apocalyptic number.

It is an amenable number.

638448604 is a deficient number, since it is larger than the sum of its proper divisors (479595260).

638448604 is a wasteful number, since it uses less digits than its factorization.

638448604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108404 (or 108402 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 43.

The square root of 638448604 is about 25267.5405213883. The cubic root of 638448604 is about 861.0769831565.

The spelling of 638448604 in words is "six hundred thirty-eight million, four hundred forty-eight thousand, six hundred four".