820479566 has 8 divisors (see below), whose sum is σ = 1231034880. Its totient is φ = 410134608.

The previous prime is 820479559. The next prime is 820479589. The reversal of 820479566 is 665974028.

820479566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 820479566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42446 + ... + 58673.

It is an arithmetic number, because the mean of its divisors is an integer number (153879360).

Almost surely, 2^820479566 is an apocalyptic number.

820479566 is a deficient number, since it is larger than the sum of its proper divisors (410555314).

820479566 is a wasteful number, since it uses less digits than its factorization.

820479566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105178.

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 820479566 is about 28644.0144881963. The cubic root of 820479566 is about 936.1725938513.

The spelling of 820479566 in words is "eight hundred twenty million, four hundred seventy-nine thousand, five hundred sixty-six".