638822870 has 32 divisors (see below), whose sum is σ = 1315020096. Its totient is φ = 218880000.

The previous prime is 638822851. The next prime is 638822881. The reversal of 638822870 is 78228836.

638822870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 208550 + ... + 211590.

It is an arithmetic number, because the mean of its divisors is an integer number (41094378).

Almost surely, 2^638822870 is an apocalyptic number.

638822870 is an abundant number, since it is smaller than the sum of its proper divisors (676197226).

638822870 is a wasteful number, since it uses less digits than its factorization.

638822870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6056.

The product of its (nonzero) digits is 258048, while the sum is 44.

The square root of 638822870 is about 25274.9454994467. The cubic root of 638822870 is about 861.2452080710.

The spelling of 638822870 in words is "six hundred thirty-eight million, eight hundred twenty-two thousand, eight hundred seventy".