7866816 has 28 divisors (see below), whose sum is σ = 20814792. Its totient is φ = 2622208.

The previous prime is 7866811. The next prime is 7866827. The reversal of 7866816 is 6186687.

7866816 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7866811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20295 + ... + 20678.

Almost surely, 2^7866816 is an apocalyptic number.

It is an amenable number.

7866816 is an abundant number, since it is smaller than the sum of its proper divisors (12947976).

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

7866816 is a wasteful number, since it uses less digits than its factorization.

7866816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40988 (or 40978 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 7866816 is about 2804.7844836992. The cubic root of 7866816 is about 198.8839167091.

It can be divided in two parts, 786681 and 6, that added together give a palindrome (786687).

The spelling of 7866816 in words is "seven million, eight hundred sixty-six thousand, eight hundred sixteen".