81113764 has 6 divisors (see below), whose sum is σ = 141949094. Its totient is φ = 40556880.

The previous prime is 81113761. The next prime is 81113771. The reversal of 81113764 is 46731118.

It can be written as a sum of positive squares in only one way, i.e., 80460900 + 652864 = 8970^2 + 808^2 .

It is not an unprimeable number, because it can be changed into a prime (81113761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10139217 + ... + 10139224.

Almost surely, 2^81113764 is an apocalyptic number.

It is an amenable number.

81113764 is a deficient number, since it is larger than the sum of its proper divisors (60835330).

81113764 is a wasteful number, since it uses less digits than its factorization.

81113764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20278445 (or 20278443 counting only the distinct ones).

The product of its digits is 4032, while the sum is 31.

The square root of 81113764 is about 9006.3180046010. The cubic root of 81113764 is about 432.8773393952.

The spelling of 81113764 in words is "eighty-one million, one hundred thirteen thousand, seven hundred sixty-four".