810869820 has 24 divisors (see below), whose sum is σ = 2270435664. Its totient is φ = 216231936.

The previous prime is 810869809. The next prime is 810869909. The reversal of 810869820 is 28968018.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6757189 + ... + 6757308.

It is an arithmetic number, because the mean of its divisors is an integer number (94601486).

Almost surely, 2^810869820 is an apocalyptic number.

It is an amenable number.

810869820 is an abundant number, since it is smaller than the sum of its proper divisors (1459565844).

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

810869820 is a wasteful number, since it uses less digits than its factorization.

810869820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13514509 (or 13514507 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 810869820 is about 28475.7760210323. The cubic root of 810869820 is about 932.5033031578.

The spelling of 810869820 in words is "eight hundred ten million, eight hundred sixty-nine thousand, eight hundred twenty".