638852370 has 128 divisors (see below), whose sum is σ = 1750339584. Its totient is φ = 148034304.

The previous prime is 638852369. The next prime is 638852377. The reversal of 638852370 is 73258836.

638852370 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (638852377) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 600459 + ... + 601521.

It is an arithmetic number, because the mean of its divisors is an integer number (13674528).

Almost surely, 2^638852370 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638852370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (875169792).

638852370 is an abundant number, since it is smaller than the sum of its proper divisors (1111487214).

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

638852370 is a wasteful number, since it uses less digits than its factorization.

638852370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176.

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 638852370 is about 25275.5290745812. The cubic root of 638852370 is about 861.2584649240.

The spelling of 638852370 in words is "six hundred thirty-eight million, eight hundred fifty-two thousand, three hundred seventy".