7998664394 has 16 divisors (see below), whose sum is σ = 13746200256. Its totient is φ = 3419448000.

The previous prime is 7998664369. The next prime is 7998664447. The reversal of 7998664394 is 4934668997.

It is a happy number.

7998664394 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 7998664394.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 706772 + ... + 717999.

It is an arithmetic number, because the mean of its divisors is an integer number (859137516).

Almost surely, 2^7998664394 is an apocalyptic number.

7998664394 is a deficient number, since it is larger than the sum of its proper divisors (5747535862).

7998664394 is a wasteful number, since it uses less digits than its factorization.

7998664394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1425181.

The product of its digits is 70543872, while the sum is 65.

The square root of 7998664394 is about 89435.2525238231. The cubic root of 7998664394 is about 1999.8886933055. Note that the first 3 decimals are identical.

The spelling of 7998664394 in words is "seven billion, nine hundred ninety-eight million, six hundred sixty-four thousand, three hundred ninety-four".