820448668 has 24 divisors (see below), whose sum is σ = 1560426560. Its totient is φ = 375192000.

The previous prime is 820448659. The next prime is 820448669. The reversal of 820448668 is 866844028.

820448668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820448669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66708 + ... + 78043.

Almost surely, 2^820448668 is an apocalyptic number.

It is an amenable number.

820448668 is a deficient number, since it is larger than the sum of its proper divisors (739977892).

820448668 is a wasteful number, since it uses less digits than its factorization.

820448668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144877 (or 144875 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 46.

The square root of 820448668 is about 28643.4751383278. The cubic root of 820448668 is about 936.1608420966.

The spelling of 820448668 in words is "eight hundred twenty million, four hundred forty-eight thousand, six hundred sixty-eight".