7856867894 has 32 divisors (see below), whose sum is σ = 12381659136. Its totient is φ = 3735406080.

The previous prime is 7856867869. The next prime is 7856867911. The reversal of 7856867894 is 4987686587.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 766934 + ... + 777110.

It is an arithmetic number, because the mean of its divisors is an integer number (386926848).

Almost surely, 2^7856867894 is an apocalyptic number.

7856867894 is a deficient number, since it is larger than the sum of its proper divisors (4524791242).

7856867894 is a wasteful number, since it uses less digits than its factorization.

7856867894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10460.

The product of its digits is 162570240, while the sum is 68.

The square root of 7856867894 is about 88638.9750279187. The cubic root of 7856867894 is about 1988.0004741729. Note that the first 3 decimals are identical.

The spelling of 7856867894 in words is "seven billion, eight hundred fifty-six million, eight hundred sixty-seven thousand, eight hundred ninety-four".