7856867798 has 48 divisors (see below), whose sum is σ = 13698112176. Its totient is φ = 3366005760.

The previous prime is 7856867791. The next prime is 7856867807. The reversal of 7856867798 is 8977686587.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7856867791) 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 23 ways as a sum of consecutive naturals, for example, 410093 + ... + 428823.

It is an arithmetic number, because the mean of its divisors is an integer number (285377337).

Almost surely, 2^7856867798 is an apocalyptic number.

7856867798 is a deficient number, since it is larger than the sum of its proper divisors (5841244378).

7856867798 is a wasteful number, since it uses less digits than its factorization.

7856867798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18849 (or 18836 counting only the distinct ones).

The product of its digits is 284497920, while the sum is 71.

The square root of 7856867798 is about 88638.9744863962. The cubic root of 7856867798 is about 1988.0004660760. Note that the first 3 decimals are identical.

The spelling of 7856867798 in words is "seven billion, eight hundred fifty-six million, eight hundred sixty-seven thousand, seven hundred ninety-eight".