810478681 has 4 divisors (see below), whose sum is σ = 810535732. Its totient is φ = 810421632.

The previous prime is 810478679. The next prime is 810478717. The reversal of 810478681 is 186874018.

810478681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 650709081 + 159769600 = 25509^2 + 12640^2 .

It is a cyclic number.

It is not a de Polignac number, because 810478681 - 2¹ = 810478679 is a prime.

It is a super-2 number, since 2×810478681² = 1313751384710999522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (810478651) 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, 11581 + ... + 41893.

It is an arithmetic number, because the mean of its divisors is an integer number (202633933).

Almost surely, 2^810478681 is an apocalyptic number.

It is an amenable number.

810478681 is a deficient number, since it is larger than the sum of its proper divisors (57051).

810478681 is a wasteful number, since it uses less digits than its factorization.

810478681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57050.

The product of its (nonzero) digits is 86016, while the sum is 43.

The square root of 810478681 is about 28468.9072674032. The cubic root of 810478681 is about 932.3533419423.

The spelling of 810478681 in words is "eight hundred ten million, four hundred seventy-eight thousand, six hundred eighty-one".