8729047550781 has 24 divisors (see below), whose sum is σ = 12644594534520. Its totient is φ = 5802773760000.

The previous prime is 8729047550737. The next prime is 8729047550789. The reversal of 8729047550781 is 1870557409278.

8729047550781 is a `hidden beast` number, since 8 + 7 + 2 + 9 + 0 + 4 + 7 + 550 + 78 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1667623563225 + 7061423987556 = 1291365^2 + 2657334^2 .

It is not a de Polignac number, because 8729047550781 - 2⁷ = 8729047550653 is a prime.

It is a super-2 number, since 2×8729047550781² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8729047550789) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9677055 + ... + 10540563.

It is an arithmetic number, because the mean of its divisors is an integer number (526858105605).

Almost surely, 2^{8729047550781} is an apocalyptic number.

It is an amenable number.

8729047550781 is a deficient number, since it is larger than the sum of its proper divisors (3915546983739).

8729047550781 is a wasteful number, since it uses less digits than its factorization.

8729047550781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866717 (or 866714 counting only the distinct ones).

The product of its (nonzero) digits is 39513600, while the sum is 63.

The spelling of 8729047550781 in words is "eight trillion, seven hundred twenty-nine billion, forty-seven million, five hundred fifty thousand, seven hundred eighty-one".