638302005 has 64 divisors (see below), whose sum is σ = 1243987200. Its totient is φ = 307964160.

The previous prime is 638301991. The next prime is 638302051. The reversal of 638302005 is 500203836.

638302005 is a `hidden beast` number, since 638 + 3 + 0 + 20 + 0 + 5 = 666.

It is not a de Polignac number, because 638302005 - 2¹⁰ = 638300981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 638302005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 339127 + ... + 341003.

It is an arithmetic number, because the mean of its divisors is an integer number (19437300).

Almost surely, 2^638302005 is an apocalyptic number.

It is an amenable number.

638302005 is a deficient number, since it is larger than the sum of its proper divisors (605685195).

638302005 is a wasteful number, since it uses less digits than its factorization.

638302005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2131 (or 2125 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 638302005 is about 25264.6394195524. The cubic root of 638302005 is about 861.0110719843.

The spelling of 638302005 in words is "six hundred thirty-eight million, three hundred two thousand, five".