810865768 has 16 divisors (see below), whose sum is σ = 1521982980. Its totient is φ = 405003648.

The previous prime is 810865763. The next prime is 810865807. The reversal of 810865768 is 867568018.

It can be written as a sum of positive squares in 2 ways, for example, as 729108004 + 81757764 = 27002^2 + 9042^2 .

It is not an unprimeable number, because it can be changed into a prime (810865763) 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, 45555 + ... + 60802.

Almost surely, 2^810865768 is an apocalyptic number.

It is an amenable number.

810865768 is a deficient number, since it is larger than the sum of its proper divisors (711117212).

810865768 is a wasteful number, since it uses less digits than its factorization.

810865768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107316 (or 107312 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 49.

The square root of 810865768 is about 28475.7048727507. The cubic root of 810865768 is about 932.5017498835.

The spelling of 810865768 in words is "eight hundred ten million, eight hundred sixty-five thousand, seven hundred sixty-eight".