638286005 has 24 divisors (see below), whose sum is σ = 905622840. Its totient is φ = 430496640.

The previous prime is 638285983. The next prime is 638286007. The reversal of 638286005 is 500682836.

638286005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 9229444 + 629056561 = 3038^2 + 25081^2 .

It is not a de Polignac number, because 638286005 - 2⁶ = 638285941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 638286005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638286007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6410 + ... + 36299.

It is an arithmetic number, because the mean of its divisors is an integer number (37734285).

Almost surely, 2^638286005 is an apocalyptic number.

It is an amenable number.

638286005 is a deficient number, since it is larger than the sum of its proper divisors (267336835).

638286005 is a wasteful number, since it uses less digits than its factorization.

638286005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42789 (or 42782 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 638286005 is about 25264.3227694708. The cubic root of 638286005 is about 861.0038777449.

The spelling of 638286005 in words is "six hundred thirty-eight million, two hundred eighty-six thousand, five".