638431743822 has 32 divisors (see below), whose sum is σ = 1330976465280. Its totient is φ = 203903787360.

The previous prime is 638431743809. The next prime is 638431743839. The reversal of 638431743822 is 228347134836.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13981588 + ... + 14027175.

It is an arithmetic number, because the mean of its divisors is an integer number (41593014540).

Almost surely, 2^638431743822 is an apocalyptic number.

638431743822 is an abundant number, since it is smaller than the sum of its proper divisors (692544721458).

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

638431743822 is a wasteful number, since it uses less digits than its factorization.

638431743822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28008928.

The product of its digits is 4644864, while the sum is 51.

The spelling of 638431743822 in words is "six hundred thirty-eight billion, four hundred thirty-one million, seven hundred forty-three thousand, eight hundred twenty-two".