638870848 has 56 divisors (see below), whose sum is σ = 1580595264. Its totient is φ = 248908800.

The previous prime is 638870807. The next prime is 638870849. The reversal of 638870848 is 848078836.

It is a tau number, because it is divible by the number of its divisors (56).

It is a junction number, because it is equal to n+sod(n) for n = 638870795 and 638870804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638870849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59893 + ... + 69748.

Almost surely, 2^638870848 is an apocalyptic number.

It is an amenable number.

638870848 is an abundant number, since it is smaller than the sum of its proper divisors (941724416).

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

638870848 is a wasteful number, since it uses less digits than its factorization.

638870848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129671 (or 129661 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 52.

The square root of 638870848 is about 25275.8946033568. The cubic root of 638870848 is about 861.2667684493.

The spelling of 638870848 in words is "six hundred thirty-eight million, eight hundred seventy thousand, eight hundred forty-eight".