638448650 has 24 divisors (see below), whose sum is σ = 1357160160. Its totient is φ = 218896560.

The previous prime is 638448641. The next prime is 638448661. The reversal of 638448650 is 56844836.

It is a zygodrome in base 3.

It is an unprimeable number.

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, 911720 + ... + 912419.

It is an arithmetic number, because the mean of its divisors is an integer number (56548340).

Almost surely, 2^638448650 is an apocalyptic number.

638448650 is an abundant number, since it is smaller than the sum of its proper divisors (718711510).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638448650 is a wasteful number, since it uses less digits than its factorization.

638448650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824158 (or 1824153 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 44.

The square root of 638448650 is about 25267.5414316470. The cubic root of 638448650 is about 861.0770038366.

The spelling of 638448650 in words is "six hundred thirty-eight million, four hundred forty-eight thousand, six hundred fifty".