810028520 has 128 divisors (see below), whose sum is σ = 2214604800. Its totient is φ = 260464896.

The previous prime is 810028519. The next prime is 810028567. The reversal of 810028520 is 25820018.

It is a Cunningham number, because it is equal to 28461²-1.

It is a super-2 number, since 2×810028520² = 1312292406426780800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 810028520.

It is an unprimeable number.

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, 568529 + ... + 569951.

It is an arithmetic number, because the mean of its divisors is an integer number (17301600).

Almost surely, 2^810028520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 810028520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1107302400).

810028520 is an abundant number, since it is smaller than the sum of its proper divisors (1404576280).

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

810028520 is a wasteful number, since it uses less digits than its factorization.

810028520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1567 (or 1563 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 810028520 is about 28460.9999824321. Note that the first 4 decimals coincide. The cubic root of 810028520 is about 932.1806921850.

Adding to 810028520 its reverse (25820018), we get a palindrome (835848538).

The spelling of 810028520 in words is "eight hundred ten million, twenty-eight thousand, five hundred twenty".