638763822 has 24 divisors (see below), whose sum is σ = 1401510240. Its totient is φ = 210225600.

The previous prime is 638763803. The next prime is 638763823. The reversal of 638763822 is 228367836.

638763822 is a `hidden beast` number, since 6 + 3 + 8 + 7 + 638 + 2 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638763823) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 223179 + ... + 226022.

It is an arithmetic number, because the mean of its divisors is an integer number (58396260).

Almost surely, 2^638763822 is an apocalyptic number.

638763822 is an abundant number, since it is smaller than the sum of its proper divisors (762746418).

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

638763822 is a wasteful number, since it uses less digits than its factorization.

638763822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449288 (or 449285 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 638763822 is about 25273.7773591523. Note that the first 3 decimals coincide. The cubic root of 638763822 is about 861.2186715685.

The spelling of 638763822 in words is "six hundred thirty-eight million, seven hundred sixty-three thousand, eight hundred twenty-two".