810028821 has 32 divisors (see below), whose sum is σ = 1258713088. Its totient is φ = 453781440.

The previous prime is 810028811. The next prime is 810028829. The reversal of 810028821 is 128820018.

It is not a de Polignac number, because 810028821 - 2⁷ = 810028693 is a prime.

It is a super-2 number, since 2×810028821² = 1312293381701300082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810028829) 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 31 ways as a sum of consecutive naturals, for example, 469266 + ... + 470988.

It is an arithmetic number, because the mean of its divisors is an integer number (39334784).

Almost surely, 2^810028821 is an apocalyptic number.

It is an amenable number.

810028821 is a deficient number, since it is larger than the sum of its proper divisors (448684267).

810028821 is a wasteful number, since it uses less digits than its factorization.

810028821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161.

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 810028821 is about 28461.0052703695. The cubic root of 810028821 is about 932.1808076486.

Adding to 810028821 its reverse (128820018), we get a palindrome (938848839).

The spelling of 810028821 in words is "eight hundred ten million, twenty-eight thousand, eight hundred twenty-one".