638231216 has 20 divisors (see below), whose sum is σ = 1413226512. Its totient is φ = 273527616.

The previous prime is 638231207. The next prime is 638231249. The reversal of 638231216 is 612132836.

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 3 ways as a sum of consecutive naturals, for example, 2849135 + ... + 2849358.

Almost surely, 2^638231216 is an apocalyptic number.

It is an amenable number.

638231216 is an abundant number, since it is smaller than the sum of its proper divisors (774995296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638231216 is a wasteful number, since it uses less digits than its factorization.

638231216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5698508 (or 5698502 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 638231216 is about 25263.2384305734. The cubic root of 638231216 is about 860.9792415103.

The spelling of 638231216 in words is "six hundred thirty-eight million, two hundred thirty-one thousand, two hundred sixteen".