9638871647 has 4 divisors (see below), whose sum is σ = 9639425976. Its totient is φ = 9638317320.

The previous prime is 9638871577. The next prime is 9638871677. The reversal of 9638871647 is 7461788369.

9638871647 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 an emirpimes, since its reverse is a distinct semiprime: 7461788369 = 7 ⋅1065969767.

It is a cyclic number.

It is not a de Polignac number, because 9638871647 - 2¹² = 9638867551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9638871677) 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 3 ways as a sum of consecutive naturals, for example, 250208 + ... + 286149.

It is an arithmetic number, because the mean of its divisors is an integer number (2409856494).

Almost surely, 2^9638871647 is an apocalyptic number.

9638871647 is a deficient number, since it is larger than the sum of its proper divisors (554329).

9638871647 is a wasteful number, since it uses less digits than its factorization.

9638871647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554328.

The product of its digits is 12192768, while the sum is 59.

The square root of 9638871647 is about 98177.7553573110. The cubic root of 9638871647 is about 2128.1818370460.

The spelling of 9638871647 in words is "nine billion, six hundred thirty-eight million, eight hundred seventy-one thousand, six hundred forty-seven".