8991506718 has 24 divisors (see below), whose sum is σ = 19505651256. Its totient is φ = 2993468400.

The previous prime is 8991506717. The next prime is 8991506759. The reversal of 8991506718 is 8176051998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8991506717) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 293373 + ... + 322568.

It is an arithmetic number, because the mean of its divisors is an integer number (812735469).

Almost surely, 2^8991506718 is an apocalyptic number.

8991506718 is an abundant number, since it is smaller than the sum of its proper divisors (10514144538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8991506718 is a wasteful number, since it uses less digits than its factorization.

8991506718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616760 (or 616757 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 54.

The square root of 8991506718 is about 94823.5557127025. Note that the first 3 decimals coincide. The cubic root of 8991506718 is about 2079.4292934681.

The spelling of 8991506718 in words is "eight billion, nine hundred ninety-one million, five hundred six thousand, seven hundred eighteen".