7289985809 has 8 divisors (see below), whose sum is σ = 7542317160. Its totient is φ = 7037718016.

The previous prime is 7289985803. The next prime is 7289985827. The reversal of 7289985809 is 9085899827.

It can be written as a sum of positive squares in 4 ways, for example, as 901500625 + 6388485184 = 30025^2 + 79928^2 .

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-7289985809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7289985803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 428897 + ... + 445569.

It is an arithmetic number, because the mean of its divisors is an integer number (942789645).

Almost surely, 2^7289985809 is an apocalyptic number.

It is an amenable number.

7289985809 is a deficient number, since it is larger than the sum of its proper divisors (252331351).

7289985809 is a wasteful number, since it uses less digits than its factorization.

7289985809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31779.

The product of its (nonzero) digits is 26127360, while the sum is 65.

The square root of 7289985809 is about 85381.4137210201. The cubic root of 7289985809 is about 1938.9899628558.

The spelling of 7289985809 in words is "seven billion, two hundred eighty-nine million, nine hundred eighty-five thousand, eight hundred nine".