38687728689 has 6 divisors (see below), whose sum is σ = 55882274786. Its totient is φ = 25791819120.

The previous prime is 38687728649. The next prime is 38687728691. The reversal of 38687728689 is 98682778683.

It can be written as a sum of positive squares in only one way, i.e., 37866046464 + 821682225 = 194592^2 + 28665^2 .

It is not a de Polignac number, because 38687728689 - 2¹⁷ = 38687597617 is a prime.

It is a super-2 number, since 2×38687728689² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38687728649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2149318252 + ... + 2149318269.

Almost surely, 2^38687728689 is an apocalyptic number.

It is an amenable number.

38687728689 is a deficient number, since it is larger than the sum of its proper divisors (17194546097).

38687728689 is a wasteful number, since it uses less digits than its factorization.

38687728689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4298636527 (or 4298636524 counting only the distinct ones).

The product of its digits is 390168576, while the sum is 72.

It can be divided in two parts, 38687 and 728689, that added together give a square (767376 = 876²).

The spelling of 38687728689 in words is "thirty-eight billion, six hundred eighty-seven million, seven hundred twenty-eight thousand, six hundred eighty-nine".