7939995864 has 16 divisors (see below), whose sum is σ = 19849989720. Its totient is φ = 2646665280.

The previous prime is 7939995857. The next prime is 7939995907. The reversal of 7939995864 is 4685999397.

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, 165416557 + ... + 165416604.

Almost surely, 2^7939995864 is an apocalyptic number.

It is an amenable number.

7939995864 is an abundant number, since it is smaller than the sum of its proper divisors (11909993856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7939995864 is a wasteful number, since it uses less digits than its factorization.

7939995864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330833170 (or 330833166 counting only the distinct ones).

The product of its digits is 132269760, while the sum is 69.

The square root of 7939995864 is about 89106.6544316416. The cubic root of 7939995864 is about 1994.9871012539.

The spelling of 7939995864 in words is "seven billion, nine hundred thirty-nine million, nine hundred ninety-five thousand, eight hundred sixty-four".