8678634991 has 4 divisors (see below), whose sum is σ = 9346222312. Its totient is φ = 8011047672.

The previous prime is 8678634989. The next prime is 8678635013. The reversal of 8678634991 is 1994368768.

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 8678634991 - 2¹ = 8678634989 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 (8678634931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333793641 + ... + 333793666.

It is an arithmetic number, because the mean of its divisors is an integer number (2336555578).

Almost surely, 2^8678634991 is an apocalyptic number.

8678634991 is a deficient number, since it is larger than the sum of its proper divisors (667587321).

8678634991 is a wasteful number, since it uses less digits than its factorization.

8678634991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667587320.

The product of its digits is 15676416, while the sum is 61.

The square root of 8678634991 is about 93159.1916613707. The cubic root of 8678634991 is about 2055.0251488053.

The spelling of 8678634991 in words is "eight billion, six hundred seventy-eight million, six hundred thirty-four thousand, nine hundred ninety-one".