811928205 has 80 divisors (see below), whose sum is σ = 1615204800. Its totient is φ = 386864640.

The previous prime is 811928189. The next prime is 811928209. The reversal of 811928205 is 502829118.

It is not a de Polignac number, because 811928205 - 2⁴ = 811928189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 811928205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811928209) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 261301 + ... + 264389.

It is an arithmetic number, because the mean of its divisors is an integer number (20190060).

Almost surely, 2^811928205 is an apocalyptic number.

It is an amenable number.

811928205 is a deficient number, since it is larger than the sum of its proper divisors (803276595).

811928205 is a wasteful number, since it uses less digits than its factorization.

811928205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3176 (or 3167 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 811928205 is about 28494.3539144161. The cubic root of 811928205 is about 932.9088423257.

The spelling of 811928205 in words is "eight hundred eleven million, nine hundred twenty-eight thousand, two hundred five".