6884518729 has 27 divisors (see below), whose sum is σ = 8006688711. Its totient is φ = 5914315440.

The previous prime is 6884518717. The next prime is 6884518733. The reversal of 6884518729 is 9278154886.

It is a happy number.

The square root of 6884518729 is 82973.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4613805625 + 2270713104 = 67925^2 + 47652^2 .

It is not a de Polignac number, because 6884518729 - 2⁷ = 6884518601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6884518709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 17341159 + ... + 17341555.

Almost surely, 2^6884518729 is an apocalyptic number.

6884518729 is the 82973-rd square number.

6884518729 is the 41487-th centered octagonal number.

It is an amenable number.

6884518729 is a deficient number, since it is larger than the sum of its proper divisors (1122169982).

6884518729 is an equidigital number, since it uses as much as digits as its factorization.

6884518729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854 (or 427 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 58.

The cubic root of 6884518729 is about 1902.3533838410.

The spelling of 6884518729 in words is "six billion, eight hundred eighty-four million, five hundred eighteen thousand, seven hundred twenty-nine".