638318327 has 8 divisors (see below), whose sum is σ = 653432832. Its totient is φ = 623267800.

The previous prime is 638318323. The next prime is 638318377. The reversal of 638318327 is 723813836.

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 638318327 - 2² = 638318323 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638318323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4502 + ... + 36012.

It is an arithmetic number, because the mean of its divisors is an integer number (81679104).

Almost surely, 2^638318327 is an apocalyptic number.

638318327 is a deficient number, since it is larger than the sum of its proper divisors (15114505).

638318327 is a wasteful number, since it uses less digits than its factorization.

638318327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31989.

The product of its digits is 145152, while the sum is 41.

The square root of 638318327 is about 25264.9624381276. The cubic root of 638318327 is about 861.0184108838.

The spelling of 638318327 in words is "six hundred thirty-eight million, three hundred eighteen thousand, three hundred twenty-seven".