823684664 has 32 divisors (see below), whose sum is σ = 1694150640. Its totient is φ = 372326400.

The previous prime is 823684633. The next prime is 823684679. The reversal of 823684664 is 466486328.

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 7 ways as a sum of consecutive naturals, for example, 9929 + ... + 41784.

Almost surely, 2^823684664 is an apocalyptic number.

It is an amenable number.

823684664 is an abundant number, since it is smaller than the sum of its proper divisors (870465976).

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

823684664 is a wasteful number, since it uses less digits than its factorization.

823684664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51911 (or 51907 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 47.

The square root of 823684664 is about 28699.9070381770. The cubic root of 823684664 is about 937.3900226310.

The spelling of 823684664 in words is "eight hundred twenty-three million, six hundred eighty-four thousand, six hundred sixty-four".