8820729 has 6 divisors (see below), whose sum is σ = 12741066. Its totient is φ = 5880480.

The previous prime is 8820697. The next prime is 8820733. The reversal of 8820729 is 9270288.

8820729 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 5405625 + 3415104 = 2325^2 + 1848^2 .

It is not a de Polignac number, because 8820729 - 2⁵ = 8820697 is a prime.

8820729 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 8820693 and 8820702.

It is not an unprimeable number, because it can be changed into a prime (8820029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 490032 + ... + 490049.

It is an arithmetic number, because the mean of its divisors is an integer number (2123511).

Almost surely, 2^8820729 is an apocalyptic number.

It is an amenable number.

8820729 is a deficient number, since it is larger than the sum of its proper divisors (3920337).

8820729 is a wasteful number, since it uses less digits than its factorization.

8820729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980087 (or 980084 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 8820729 is about 2969.9712119817. The cubic root of 8820729 is about 206.6180030525.

The spelling of 8820729 in words is "eight million, eight hundred twenty thousand, seven hundred twenty-nine".