638336255 has 16 divisors (see below), whose sum is σ = 834127200. Its totient is φ = 467107200.

The previous prime is 638336249. The next prime is 638336263. The reversal of 638336255 is 552633836.

It is not a de Polignac number, because 638336255 - 2⁶ = 638336191 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 (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113096 + ... + 118605.

It is an arithmetic number, because the mean of its divisors is an integer number (52132950).

Almost surely, 2^638336255 is an apocalyptic number.

638336255 is a deficient number, since it is larger than the sum of its proper divisors (195790945).

638336255 is a wasteful number, since it uses less digits than its factorization.

638336255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231754.

The product of its digits is 388800, while the sum is 41.

The square root of 638336255 is about 25265.3172352931. The cubic root of 638336255 is about 861.0264717488.

The spelling of 638336255 in words is "six hundred thirty-eight million, three hundred thirty-six thousand, two hundred fifty-five".