638122256 has 20 divisors (see below), whose sum is σ = 1237606800. Its totient is φ = 318739872.

The previous prime is 638122223. The next prime is 638122283. The reversal of 638122256 is 652221836.

It is an unprimeable number.

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, 3266 + ... + 35873.

It is an arithmetic number, because the mean of its divisors is an integer number (61880340).

Almost surely, 2^638122256 is an apocalyptic number.

It is an amenable number.

638122256 is a deficient number, since it is larger than the sum of its proper divisors (599484544).

638122256 is a wasteful number, since it uses less digits than its factorization.

638122256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40166 (or 40160 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 638122256 is about 25261.0818454001. The cubic root of 638122256 is about 860.9302427384.

The spelling of 638122256 in words is "six hundred thirty-eight million, one hundred twenty-two thousand, two hundred fifty-six".