7868878856 has 8 divisors (see below), whose sum is σ = 14754147870. Its totient is φ = 3934439424.

The previous prime is 7868878847. The next prime is 7868878867. The reversal of 7868878856 is 6588788687.

It can be written as a sum of positive squares in only one way, i.e., 7162913956 + 705964900 = 84634^2 + 26570^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 7868878856.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 491804921 + ... + 491804936.

Almost surely, 2^7868878856 is an apocalyptic number.

It is an amenable number.

7868878856 is a deficient number, since it is larger than the sum of its proper divisors (6885269014).

7868878856 is a wasteful number, since it uses less digits than its factorization.

7868878856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983609863 (or 983609859 counting only the distinct ones).

The product of its digits is 289013760, while the sum is 71.

The square root of 7868878856 is about 88706.7013026637. The cubic root of 7868878856 is about 1989.0129913445.

The spelling of 7868878856 in words is "seven billion, eight hundred sixty-eight million, eight hundred seventy-eight thousand, eight hundred fifty-six".