7705728385 has 16 divisors (see below), whose sum is σ = 9306722880. Its totient is φ = 6124749120.

The previous prime is 7705728377. The next prime is 7705728389. The reversal of 7705728385 is 5838275077.

It is a happy number.

It is not a de Polignac number, because 7705728385 - 2³ = 7705728377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7705728389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1136014 + ... + 1142776.

It is an arithmetic number, because the mean of its divisors is an integer number (581670180).

Almost surely, 2^7705728385 is an apocalyptic number.

It is an amenable number.

7705728385 is a deficient number, since it is larger than the sum of its proper divisors (1600994495).

7705728385 is a wasteful number, since it uses less digits than its factorization.

7705728385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8208.

The product of its (nonzero) digits is 3292800, while the sum is 52.

The square root of 7705728385 is about 87782.2783083237. The cubic root of 7705728385 is about 1975.1703861974.

The spelling of 7705728385 in words is "seven billion, seven hundred five million, seven hundred twenty-eight thousand, three hundred eighty-five".