638424784 has 40 divisors (see below), whose sum is σ = 1269240192. Its totient is φ = 310920960.

The previous prime is 638424779. The next prime is 638424791. The reversal of 638424784 is 487424836.

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, 295452 + ... + 297604.

Almost surely, 2^638424784 is an apocalyptic number.

It is an amenable number.

638424784 is a deficient number, since it is larger than the sum of its proper divisors (630815408).

638424784 is a wasteful number, since it uses less digits than its factorization.

638424784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2635 (or 2629 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 46.

The square root of 638424784 is about 25267.0691612621. The cubic root of 638424784 is about 861.0662743285.

The spelling of 638424784 in words is "six hundred thirty-eight million, four hundred twenty-four thousand, seven hundred eighty-four".