638311134285 has 48 divisors (see below), whose sum is σ = 1225003141440. Its totient is φ = 304865003520.

The previous prime is 638311134239. The next prime is 638311134289. The reversal of 638311134285 is 582431113836.

It is a happy number.

638311134285 is a `hidden beast` number, since 638 + 3 + 1 + 1 + 1 + 3 + 4 + 2 + 8 + 5 = 666.

It is not a de Polignac number, because 638311134285 - 2²⁵ = 638277579853 is a prime.

It is a super-2 number, since 2×638311134285² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 638311134285.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638311134289) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9590100 + ... + 9656429.

It is an arithmetic number, because the mean of its divisors is an integer number (25520898780).

Almost surely, 2^638311134285 is an apocalyptic number.

It is an amenable number.

638311134285 is a deficient number, since it is larger than the sum of its proper divisors (586692007155).

638311134285 is a wasteful number, since it uses less digits than its factorization.

638311134285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19246618 (or 19246615 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The spelling of 638311134285 in words is "six hundred thirty-eight billion, three hundred eleven million, one hundred thirty-four thousand, two hundred eighty-five".