638448700 has 18 divisors (see below), whose sum is σ = 1385433896. Its totient is φ = 255379440.

The previous prime is 638448673. The next prime is 638448703. The reversal of 638448700 is 7844836.

638448700 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638448703) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3192144 + ... + 3192343.

Almost surely, 2^638448700 is an apocalyptic number.

It is an amenable number.

638448700 is an abundant number, since it is smaller than the sum of its proper divisors (746985196).

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

638448700 is a wasteful number, since it uses less digits than its factorization.

638448700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6384501 (or 6384494 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 40.

The square root of 638448700 is about 25267.5424210587. The cubic root of 638448700 is about 861.0770263149.

The spelling of 638448700 in words is "six hundred thirty-eight million, four hundred forty-eight thousand, seven hundred".