638783313 has 16 divisors (see below), whose sum is σ = 1030642560. Its totient is φ = 343547136.

The previous prime is 638783311. The next prime is 638783323. The reversal of 638783313 is 313387836.

It is not a de Polignac number, because 638783313 - 2¹ = 638783311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638783311) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 894298 + ... + 895011.

It is an arithmetic number, because the mean of its divisors is an integer number (64415160).

Almost surely, 2^638783313 is an apocalyptic number.

It is an amenable number.

638783313 is a deficient number, since it is larger than the sum of its proper divisors (391859247).

638783313 is a wasteful number, since it uses less digits than its factorization.

638783313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789336.

The product of its digits is 217728, while the sum is 42.

The square root of 638783313 is about 25274.1629534986. The cubic root of 638783313 is about 861.2274311141.

The spelling of 638783313 in words is "six hundred thirty-eight million, seven hundred eighty-three thousand, three hundred thirteen".