638512030 has 32 divisors (see below), whose sum is σ = 1238981184. Its totient is φ = 235520256.

The previous prime is 638512013. The next prime is 638512057. The reversal of 638512030 is 30215836.

It is a super-2 number, since 2×638512030² = 815395224909441800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 638512030.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175914 + ... + 179506.

It is an arithmetic number, because the mean of its divisors is an integer number (38718162).

Almost surely, 2^638512030 is an apocalyptic number.

638512030 is a deficient number, since it is larger than the sum of its proper divisors (600469154).

638512030 is a wasteful number, since it uses less digits than its factorization.

638512030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4980.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 638512030 is about 25268.7955787370. The cubic root of 638512030 is about 861.1054964724.

Adding to 638512030 its reverse (30215836), we get a palindrome (668727866).

The spelling of 638512030 in words is "six hundred thirty-eight million, five hundred twelve thousand, thirty".