811030820 has 24 divisors (see below), whose sum is σ = 1761895800. Its totient is φ = 313225472.

The previous prime is 811030811. The next prime is 811030837. The reversal of 811030820 is 28030118.

It can be written as a sum of positive squares in 4 ways, for example, as 306040036 + 504990784 = 17494^2 + 22472^2 .

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, 698585 + ... + 699744.

It is an arithmetic number, because the mean of its divisors is an integer number (73412325).

Almost surely, 2^811030820 is an apocalyptic number.

It is an amenable number.

811030820 is an abundant number, since it is smaller than the sum of its proper divisors (950864980).

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

811030820 is a wasteful number, since it uses less digits than its factorization.

811030820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398367 (or 1398365 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 811030820 is about 28478.6028449431. The cubic root of 811030820 is about 932.5650159394.

Adding to 811030820 its reverse (28030118), we get a palindrome (839060938).

The spelling of 811030820 in words is "eight hundred eleven million, thirty thousand, eight hundred twenty".