7991379609 has 16 divisors (see below), whose sum is σ = 11048239104. Its totient is φ = 5132595600.

The previous prime is 7991379593. The next prime is 7991379611. The reversal of 7991379609 is 9069731997.

It is not a de Polignac number, because 7991379609 - 2⁴ = 7991379593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7991379679) 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 15 ways as a sum of consecutive naturals, for example, 171927 + ... + 213404.

It is an arithmetic number, because the mean of its divisors is an integer number (690514944).

Almost surely, 2^7991379609 is an apocalyptic number.

It is an amenable number.

7991379609 is a deficient number, since it is larger than the sum of its proper divisors (3056859495).

7991379609 is a wasteful number, since it uses less digits than its factorization.

7991379609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385588.

The product of its (nonzero) digits is 5786802, while the sum is 60.

The square root of 7991379609 is about 89394.5166606990. The cubic root of 7991379609 is about 1999.2813759040.

The spelling of 7991379609 in words is "seven billion, nine hundred ninety-one million, three hundred seventy-nine thousand, six hundred nine".