638700052 has 12 divisors (see below), whose sum is σ = 1123343200. Its totient is φ = 317744856.

The previous prime is 638700043. The next prime is 638700053. The reversal of 638700052 is 250007836.

It is a junction number, because it is equal to n+sod(n) for n = 638699987 and 638700023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638700053) 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 3 ways as a sum of consecutive naturals, for example, 400398 + ... + 401989.

Almost surely, 2^638700052 is an apocalyptic number.

It is an amenable number.

638700052 is a deficient number, since it is larger than the sum of its proper divisors (484643148).

638700052 is a wasteful number, since it uses less digits than its factorization.

638700052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802590 (or 802588 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 638700052 is about 25272.5157433921. The cubic root of 638700052 is about 861.1900111359.

Adding to 638700052 its reverse (250007836), we get a palindrome (888707888).

The spelling of 638700052 in words is "six hundred thirty-eight million, seven hundred thousand, fifty-two".