638236016 has 40 divisors (see below), whose sum is σ = 1407659904. Its totient is φ = 277492160.

The previous prime is 638235959. The next prime is 638236021. The reversal of 638236016 is 610632836.

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, 74786 + ... + 82881.

Almost surely, 2^638236016 is an apocalyptic number.

It is an amenable number.

638236016 is an abundant number, since it is smaller than the sum of its proper divisors (769423888).

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

638236016 is a wasteful number, since it uses less digits than its factorization.

638236016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157709 (or 157703 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 638236016 is about 25263.3334300919. Note that the first 3 decimals coincide. The cubic root of 638236016 is about 860.9813999182.

The spelling of 638236016 in words is "six hundred thirty-eight million, two hundred thirty-six thousand, sixteen".