8181998736 has 40 divisors (see below), whose sum is σ = 21199592544. Its totient is φ = 2719234560.

The previous prime is 8181998729. The next prime is 8181998809. The reversal of 8181998736 is 6378991818.

It is a self number, because there is not a number n which added to its sum of digits gives 8181998736.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236730 + ... + 269081.

Almost surely, 2^8181998736 is an apocalyptic number.

It is an amenable number.

8181998736 is an abundant number, since it is smaller than the sum of its proper divisors (13017593808).

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

8181998736 is a wasteful number, since it uses less digits than its factorization.

8181998736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506159 (or 506153 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 60.

The square root of 8181998736 is about 90454.4014186153. The cubic root of 8181998736 is about 2015.0529809745.

The spelling of 8181998736 in words is "eight billion, one hundred eighty-one million, nine hundred ninety-eight thousand, seven hundred thirty-six".