638806055 has 8 divisors (see below), whose sum is σ = 793000800. Its totient is φ = 493422496.

The previous prime is 638806019. The next prime is 638806067. The reversal of 638806055 is 550608836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 638806055 - 2⁸ = 638805799 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2202635 + ... + 2202924.

It is an arithmetic number, because the mean of its divisors is an integer number (99125100).

Almost surely, 2^638806055 is an apocalyptic number.

638806055 is a deficient number, since it is larger than the sum of its proper divisors (154194745).

638806055 is a wasteful number, since it uses less digits than its factorization.

638806055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4405593.

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 638806055 is about 25274.6128555909. The cubic root of 638806055 is about 861.2376514822.

The spelling of 638806055 in words is "six hundred thirty-eight million, eight hundred six thousand, fifty-five".