810220 has 24 divisors (see below), whose sum is σ = 1802304. Its totient is φ = 304896.

The previous prime is 810209. The next prime is 810223. The reversal of 810220 is 22018.

It is a self number, because there is not a number n which added to its sum of digits gives 810220.

It is not an unprimeable number, because it can be changed into a prime (810223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 852 + ... + 1531.

It is an arithmetic number, because the mean of its divisors is an integer number (75096).

2⁸¹⁰²²⁰ is an apocalyptic number.

It is an amenable number.

810220 is an abundant number, since it is smaller than the sum of its proper divisors (992084).

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

810220 is a wasteful number, since it uses less digits than its factorization.

810220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2409 (or 2407 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 810220 is about 900.1222139243. The cubic root of 810220 is about 93.2254138116.

Adding to 810220 its reverse (22018), we get a palindrome (832238).

The spelling of 810220 in words is "eight hundred ten thousand, two hundred twenty".