805665204 has 60 divisors (see below), whose sum is σ = 2109853284. Its totient is φ = 268085376.

The previous prime is 805665197. The next prime is 805665221. The reversal of 805665204 is 402566508.

805665204 is a `hidden beast` number, since 80 + 56 + 6 + 520 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 475152804 + 330512400 = 21798^2 + 18180^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 217512 + ... + 221184.

Almost surely, 2^805665204 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 805665204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1054926642).

805665204 is an abundant number, since it is smaller than the sum of its proper divisors (1304188080).

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

805665204 is a wasteful number, since it uses less digits than its factorization.

805665204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4366 (or 4355 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 805665204 is about 28384.2421776591. The cubic root of 805665204 is about 930.5039100552.

The spelling of 805665204 in words is "eight hundred five million, six hundred sixty-five thousand, two hundred four".