810811216 has 20 divisors (see below), whose sum is σ = 1575618772. Its totient is φ = 404199936.

The previous prime is 810811189. The next prime is 810811237. The reversal of 810811216 is 612118018.

It can be written as a sum of positive squares in 2 ways, for example, as 114062400 + 696748816 = 10680^2 + 26396^2 .

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, 69795 + ... + 80578.

Almost surely, 2^810811216 is an apocalyptic number.

It is an amenable number.

810811216 is a deficient number, since it is larger than the sum of its proper divisors (764807556).

810811216 is a wasteful number, since it uses less digits than its factorization.

810811216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150718 (or 150712 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 28.

The square root of 810811216 is about 28474.7469874624. The cubic root of 810811216 is about 932.4808376774.

The spelling of 810811216 in words is "eight hundred ten million, eight hundred eleven thousand, two hundred sixteen".