810020889 has 24 divisors (see below), whose sum is σ = 1217503872. Its totient is φ = 518537760.

The previous prime is 810020833. The next prime is 810020899. The reversal of 810020889 is 988020018.

It is not a de Polignac number, because 810020889 - 2⁸ = 810020633 is a prime.

It is a super-2 number, since 2×810020889² = 1312267681232700642, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (810020899) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 4354 + ... + 40484.

It is an arithmetic number, because the mean of its divisors is an integer number (50729328).

Almost surely, 2^810020889 is an apocalyptic number.

It is an amenable number.

810020889 is a deficient number, since it is larger than the sum of its proper divisors (407482983).

810020889 is a wasteful number, since it uses less digits than its factorization.

810020889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36237 (or 36234 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 810020889 is about 28460.8659214719. The cubic root of 810020889 is about 932.1777649247.

The spelling of 810020889 in words is "eight hundred ten million, twenty thousand, eight hundred eighty-nine".