820839872 has 14 divisors (see below), whose sum is σ = 1628854248. Its totient is φ = 410419904.

The previous prime is 820839853. The next prime is 820839911. The reversal of 820839872 is 278938028.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6412748 + ... + 6412875.

It is an arithmetic number, because the mean of its divisors is an integer number (116346732).

Almost surely, 2^820839872 is an apocalyptic number.

It is an amenable number.

820839872 is a deficient number, since it is larger than the sum of its proper divisors (808014376).

820839872 is a wasteful number, since it uses less digits than its factorization.

820839872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12825635 (or 12825625 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 820839872 is about 28650.3031746612. The cubic root of 820839872 is about 936.3096109705.

The spelling of 820839872 in words is "eight hundred twenty million, eight hundred thirty-nine thousand, eight hundred seventy-two".