810781023 has 16 divisors (see below), whose sum is σ = 1172581760. Its totient is φ = 495349344.

The previous prime is 810781007. The next prime is 810781031. The reversal of 810781023 is 320187018.

It is a happy number.

810781023 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 810781023 - 2⁴ = 810781007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810781063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69361 + ... + 80202.

It is an arithmetic number, because the mean of its divisors is an integer number (73286360).

Almost surely, 2^810781023 is an apocalyptic number.

810781023 is a deficient number, since it is larger than the sum of its proper divisors (361800737).

810781023 is a wasteful number, since it uses less digits than its factorization.

810781023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149718.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 810781023 is about 28474.2168110029. The cubic root of 810781023 is about 932.4692629553.

The spelling of 810781023 in words is "eight hundred ten million, seven hundred eighty-one thousand, twenty-three".