811044820 has 12 divisors (see below), whose sum is σ = 1703194164. Its totient is φ = 324417920.

The previous prime is 811044809. The next prime is 811044833. The reversal of 811044820 is 28440118.

It can be written as a sum of positive squares in 2 ways, for example, as 270668304 + 540376516 = 16452^2 + 23246^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20276101 + ... + 20276140.

It is an arithmetic number, because the mean of its divisors is an integer number (141932847).

Almost surely, 2^811044820 is an apocalyptic number.

It is an amenable number.

811044820 is an abundant number, since it is smaller than the sum of its proper divisors (892149344).

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

811044820 is a wasteful number, since it uses less digits than its factorization.

811044820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40552250 (or 40552248 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 811044820 is about 28478.8486424574. The cubic root of 811044820 is about 932.5703818823.

Adding to 811044820 its reverse (28440118), we get a palindrome (839484938).

The spelling of 811044820 in words is "eight hundred eleven million, forty-four thousand, eight hundred twenty".