827856813 has 12 divisors (see below), whose sum is σ = 1284023040. Its totient is φ = 473060952.

The previous prime is 827856811. The next prime is 827856817. The reversal of 827856813 is 318658728.

827856813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 827856813 - 2¹ = 827856811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (827856811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2815693 + ... + 2815986.

It is an arithmetic number, because the mean of its divisors is an integer number (107001920).

Almost surely, 2^827856813 is an apocalyptic number.

It is an amenable number.

827856813 is a deficient number, since it is larger than the sum of its proper divisors (456166227).

827856813 is a wasteful number, since it uses less digits than its factorization.

827856813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5631696 (or 5631689 counting only the distinct ones).

The product of its digits is 645120, while the sum is 48.

The square root of 827856813 is about 28772.5009861847. The cubic root of 827856813 is about 938.9700553327.

It can be divided in two parts, 82785 and 6813, that added together give a palindrome (89598).

The spelling of 827856813 in words is "eight hundred twenty-seven million, eight hundred fifty-six thousand, eight hundred thirteen".