823218804 has 18 divisors (see below), whose sum is σ = 2080914290. Its totient is φ = 274406256.

The previous prime is 823218713. The next prime is 823218827. The reversal of 823218804 is 408812328.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 820822500 + 2396304 = 28650^2 + 1548^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 22867189 = 823218804 / (8 + 2 + 3 + 2 + 1 + 8 + 8 + 0 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11433559 + ... + 11433630.

Almost surely, 2^823218804 is an apocalyptic number.

It is an amenable number.

823218804 is an abundant number, since it is smaller than the sum of its proper divisors (1257695486).

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

823218804 is a wasteful number, since it uses less digits than its factorization.

823218804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22867199 (or 22867194 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The square root of 823218804 is about 28691.7898361186. The cubic root of 823218804 is about 937.2132661249.

It can be divided in two parts, 82321 and 8804, that added together give a cube (91125 = 45³).

The spelling of 823218804 in words is "eight hundred twenty-three million, two hundred eighteen thousand, eight hundred four".