6392939668 has 12 divisors (see below), whose sum is σ = 11340900340. Its totient is φ = 3152682432.

The previous prime is 6392939621. The next prime is 6392939681. The reversal of 6392939668 is 8669392936.

It can be written as a sum of positive squares in 2 ways, for example, as 4145041924 + 2247897744 = 64382^2 + 47412^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10946523 + ... + 10947106.

Almost surely, 2^6392939668 is an apocalyptic number.

It is an amenable number.

6392939668 is a deficient number, since it is larger than the sum of its proper divisors (4947960672).

6392939668 is a wasteful number, since it uses less digits than its factorization.

6392939668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21893706 (or 21893704 counting only the distinct ones).

The product of its digits is 22674816, while the sum is 61.

The square root of 6392939668 is about 79955.8607482904. The cubic root of 6392939668 is about 1855.9525497710.

The spelling of 6392939668 in words is "six billion, three hundred ninety-two million, nine hundred thirty-nine thousand, six hundred sixty-eight".