7647985109 has 16 divisors (see below), whose sum is σ = 8187791040. Its totient is φ = 7118426880.

The previous prime is 7647985057. The next prime is 7647985151. The reversal of 7647985109 is 9015897467.

It is a cyclic number.

It is not a de Polignac number, because 7647985109 - 2²⁰ = 7646936533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7647985309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1039574 + ... + 1046904.

It is an arithmetic number, because the mean of its divisors is an integer number (511736940).

Almost surely, 2^7647985109 is an apocalyptic number.

It is an amenable number.

7647985109 is a deficient number, since it is larger than the sum of its proper divisors (539805931).

7647985109 is a wasteful number, since it uses less digits than its factorization.

7647985109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8020.

The product of its (nonzero) digits is 3810240, while the sum is 56.

The square root of 7647985109 is about 87452.7592989495. The cubic root of 7647985109 is about 1970.2243304021.

The spelling of 7647985109 in words is "seven billion, six hundred forty-seven million, nine hundred eighty-five thousand, one hundred nine".