8181367772 has 24 divisors (see below), whose sum is σ = 14539224672. Its totient is φ = 4027464000.

The previous prime is 8181367769. The next prime is 8181367783. The reversal of 8181367772 is 2777631818.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 8181367772.

It is a congruent number.

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, 188522 + ... + 227822.

It is an arithmetic number, because the mean of its divisors is an integer number (605801028).

Almost surely, 2^8181367772 is an apocalyptic number.

It is an amenable number.

8181367772 is a deficient number, since it is larger than the sum of its proper divisors (6357856900).

8181367772 is a wasteful number, since it uses less digits than its factorization.

8181367772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40109 (or 40107 counting only the distinct ones).

The product of its digits is 790272, while the sum is 50.

The square root of 8181367772 is about 90450.9136051151. The cubic root of 8181367772 is about 2015.0011819535.

The spelling of 8181367772 in words is "eight billion, one hundred eighty-one million, three hundred sixty-seven thousand, seven hundred seventy-two".