638027828 has 24 divisors (see below), whose sum is σ = 1188532800. Its totient is φ = 298824768.

The previous prime is 638027791. The next prime is 638027837. The reversal of 638027828 is 828720836.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 40400 + ... + 53927.

It is an arithmetic number, because the mean of its divisors is an integer number (49522200).

Almost surely, 2^638027828 is an apocalyptic number.

It is an amenable number.

638027828 is a deficient number, since it is larger than the sum of its proper divisors (550504972).

638027828 is a wasteful number, since it uses less digits than its factorization.

638027828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94439 (or 94437 counting only the distinct ones).

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

The square root of 638027828 is about 25259.2127351586. The cubic root of 638027828 is about 860.8877744232.

The spelling of 638027828 in words is "six hundred thirty-eight million, twenty-seven thousand, eight hundred twenty-eight".