810909128 has 16 divisors (see below), whose sum is σ = 1529245980. Its totient is φ = 403110208.

The previous prime is 810909083. The next prime is 810909133. The reversal of 810909128 is 821909018.

810909128 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 802135684 + 8773444 = 28322^2 + 2962^2 .

It is a super-2 number, since 2×810909128² = 1315147227747440768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 810909091 and 810909100.

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, 291575 + ... + 294342.

Almost surely, 2^810909128 is an apocalyptic number.

It is an amenable number.

810909128 is a deficient number, since it is larger than the sum of its proper divisors (718336852).

810909128 is a wasteful number, since it uses less digits than its factorization.

810909128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586096 (or 586092 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 810909128 is about 28476.4662133489. The cubic root of 810909128 is about 932.5183710296.

The spelling of 810909128 in words is "eight hundred ten million, nine hundred nine thousand, one hundred twenty-eight".