823663564 has 12 divisors (see below), whose sum is σ = 1442884464. Its totient is φ = 411410864.

The previous prime is 823663537. The next prime is 823663601. The reversal of 823663564 is 465366328.

It is a super-2 number, since 2×823663564² = 1356843333322364192, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 823663564.

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 3 ways as a sum of consecutive naturals, for example, 100807 + ... + 108670.

It is an arithmetic number, because the mean of its divisors is an integer number (120240372).

Almost surely, 2^823663564 is an apocalyptic number.

It is an amenable number.

823663564 is a deficient number, since it is larger than the sum of its proper divisors (619220900).

823663564 is a wasteful number, since it uses less digits than its factorization.

823663564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210464 (or 210462 counting only the distinct ones).

The product of its digits is 622080, while the sum is 43.

The square root of 823663564 is about 28699.5394388133. The cubic root of 823663564 is about 937.3820183144.

The spelling of 823663564 in words is "eight hundred twenty-three million, six hundred sixty-three thousand, five hundred sixty-four".