638793830 has 32 divisors (see below), whose sum is σ = 1172335680. Its totient is φ = 250542720.

The previous prime is 638793829. The next prime is 638793893. The reversal of 638793830 is 38397836.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217532 + ... + 220448.

It is an arithmetic number, because the mean of its divisors is an integer number (36635490).

Almost surely, 2^638793830 is an apocalyptic number.

638793830 is a deficient number, since it is larger than the sum of its proper divisors (533541850).

638793830 is a wasteful number, since it uses less digits than its factorization.

638793830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3344.

The product of its (nonzero) digits is 653184, while the sum is 47.

The square root of 638793830 is about 25274.3710109668. The cubic root of 638793830 is about 861.2321575364.

The spelling of 638793830 in words is "six hundred thirty-eight million, seven hundred ninety-three thousand, eight hundred thirty".