7128715745 has 8 divisors (see below), whose sum is σ = 8555619816. Its totient is φ = 5702198656.

The previous prime is 7128715739. The next prime is 7128715747. The reversal of 7128715745 is 5475178217.

7128715745 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 4 ways, for example, as 1326999184 + 5801716561 = 36428^2 + 76169^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 7128715745 - 2¹² = 7128711649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7128715745.

It is not an unprimeable number, because it can be changed into a prime (7128715747) 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 7 ways as a sum of consecutive naturals, for example, 54542 + ... + 131271.

It is an arithmetic number, because the mean of its divisors is an integer number (1069452477).

Almost surely, 2^7128715745 is an apocalyptic number.

It is an amenable number.

7128715745 is a deficient number, since it is larger than the sum of its proper divisors (1426904071).

7128715745 is a wasteful number, since it uses less digits than its factorization.

7128715745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193491.

The product of its digits is 548800, while the sum is 47.

The square root of 7128715745 is about 84431.7223856058. The cubic root of 7128715745 is about 1924.5850115727.

The spelling of 7128715745 in words is "seven billion, one hundred twenty-eight million, seven hundred fifteen thousand, seven hundred forty-five".