8991678671 has 4 divisors (see below), whose sum is σ = 9027502344. Its totient is φ = 8955855000.

The previous prime is 8991678637. The next prime is 8991678679. The reversal of 8991678671 is 1768761998.

8991678671 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.

It is a cyclic number.

It is not a de Polignac number, because 8991678671 - 2²⁶ = 8924569807 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 (8991678679) 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, 17911460 + ... + 17911961.

It is an arithmetic number, because the mean of its divisors is an integer number (2256875586).

Almost surely, 2^8991678671 is an apocalyptic number.

8991678671 is a deficient number, since it is larger than the sum of its proper divisors (35823673).

8991678671 is a wasteful number, since it uses less digits than its factorization.

8991678671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35823672.

The product of its digits is 9144576, while the sum is 62.

The square root of 8991678671 is about 94824.4624081782. The cubic root of 8991678671 is about 2079.4425490079.

The spelling of 8991678671 in words is "eight billion, nine hundred ninety-one million, six hundred seventy-eight thousand, six hundred seventy-one".