38628364681 has 3 divisors (see below), whose sum is σ = 38628561223. Its totient is φ = 38628168140.

The previous prime is 38628364673. The next prime is 38628364693. The reversal of 38628364681 is 18646382683.

The square root of 38628364681 is 196541.

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

38628364681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 8233929081 + 30394435600 = 90741^2 + 174340^2 .

It is not a de Polignac number, because 38628364681 - 2³ = 38628364673 is a prime.

It is a super-2 number, since 2×38628364681² (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 (38628364081) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 98271 + ... + 294811.

Almost surely, 2^38628364681 is an apocalyptic number.

38628364681 is the 196541-st square number.

38628364681 is the 98271-st centered octagonal number.

It is an amenable number.

38628364681 is a deficient number, since it is larger than the sum of its proper divisors (196542).

38628364681 is an frugal number, since it uses more digits than its factorization.

38628364681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393082 (or 196541 counting only the distinct ones).

The product of its digits is 7962624, while the sum is 55.

The spelling of 38628364681 in words is "thirty-eight billion, six hundred twenty-eight million, three hundred sixty-four thousand, six hundred eighty-one".