8720520329 has 8 divisors (see below), whose sum is σ = 8754514560. Its totient is φ = 8686591200.

The previous prime is 8720520293. The next prime is 8720520409. The reversal of 8720520329 is 9230250278.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8720520329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8720520292 and 8720520301.

It is not an unprimeable number, because it can be changed into a prime (8720520229) 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 in 7 ways as a sum of consecutive naturals, for example, 261269 + ... + 292749.

It is an arithmetic number, because the mean of its divisors is an integer number (1094314320).

Almost surely, 2^8720520329 is an apocalyptic number.

It is an amenable number.

8720520329 is a deficient number, since it is larger than the sum of its proper divisors (33994231).

8720520329 is a wasteful number, since it uses less digits than its factorization.

8720520329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32551.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 8720520329 is about 93383.7262535609. The cubic root of 8720520329 is about 2058.3258721353.

The spelling of 8720520329 in words is "eight billion, seven hundred twenty million, five hundred twenty thousand, three hundred twenty-nine".