638500052 has 24 divisors (see below), whose sum is σ = 1149157800. Its totient is φ = 310231040.

The previous prime is 638500013. The next prime is 638500099. The reversal of 638500052 is 250005836.

638500052 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 171767236 + 466732816 = 13106^2 + 21604^2 .

It is a junction number, because it is equal to n+sod(n) for n = 638499988 and 638500024.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34574 + ... + 49722.

It is an arithmetic number, because the mean of its divisors is an integer number (47881575).

Almost surely, 2^638500052 is an apocalyptic number.

It is an amenable number.

638500052 is a deficient number, since it is larger than the sum of its proper divisors (510657748).

638500052 is a wasteful number, since it uses less digits than its factorization.

638500052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15451 (or 15449 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 638500052 is about 25268.5585659333. The cubic root of 638500052 is about 861.1001118774.

Adding to 638500052 its reverse (250005836), we get a palindrome (888505888).

The spelling of 638500052 in words is "six hundred thirty-eight million, five hundred thousand, fifty-two".