9805720745 has 8 divisors (see below), whose sum is σ = 11767397640. Its totient is φ = 7844221440.

The previous prime is 9805720733. The next prime is 9805720783. The reversal of 9805720745 is 5470275089.

It is a happy number.

9805720745 is digitally balanced in base 2, 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 4 ways, for example, as 391287961 + 9414432784 = 19781^2 + 97028^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-9805720745 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 9805720745.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 182585 + ... + 230105.

It is an arithmetic number, because the mean of its divisors is an integer number (1470924705).

Almost surely, 2^9805720745 is an apocalyptic number.

It is an amenable number.

9805720745 is a deficient number, since it is larger than the sum of its proper divisors (1961676895).

9805720745 is a wasteful number, since it uses less digits than its factorization.

9805720745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88795.

The product of its (nonzero) digits is 705600, while the sum is 47.

The square root of 9805720745 is about 99023.8392762066. The cubic root of 9805720745 is about 2140.3912832286.

The spelling of 9805720745 in words is "nine billion, eight hundred five million, seven hundred twenty thousand, seven hundred forty-five".