38684780044681 has 9 divisors (see below), whose sum is σ = 39428789266069. Its totient is φ = 37954555109536.

The previous prime is 38684780044679. The next prime is 38684780044769. The reversal of 38684780044681 is 18644008748683.

The square root of 38684780044681 is 6219709.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 346145132281 + 38338634912400 = 588341^2 + 6191820^2 .

It is not a de Polignac number, because 38684780044681 - 2¹ = 38684780044679 is a prime.

It is a super-2 number, since 2×38684780044681² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38684780044481) 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 8 ways as a sum of consecutive naturals, for example, 329585901 + ... + 329703253.

Almost surely, 2^{38684780044681} is an apocalyptic number.

38684780044681 is the 6219709-th square number.

38684780044681 is the 3109855-th centered octagonal number.

It is an amenable number.

38684780044681 is a deficient number, since it is larger than the sum of its proper divisors (744009221388).

38684780044681 is an frugal number, since it uses more digits than its factorization.

38684780044681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234812 (or 117406 counting only the distinct ones).

The product of its (nonzero) digits is 198180864, while the sum is 67.

The spelling of 38684780044681 in words is "thirty-eight trillion, six hundred eighty-four billion, seven hundred eighty million, forty-four thousand, six hundred eighty-one".