820724836 has 36 divisors (see below), whose sum is σ = 1520446032. Its totient is φ = 387584496.

The previous prime is 820724819. The next prime is 820724843. The reversal of 820724836 is 638427028.

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 11 ways as a sum of consecutive naturals, for example, 639051 + ... + 640333.

It is an arithmetic number, because the mean of its divisors is an integer number (42234612).

Almost surely, 2^820724836 is an apocalyptic number.

It is an amenable number.

820724836 is a deficient number, since it is larger than the sum of its proper divisors (699721196).

820724836 is a wasteful number, since it uses less digits than its factorization.

820724836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1768 (or 1747 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 40.

The square root of 820724836 is about 28648.2955164875. The cubic root of 820724836 is about 936.2658694532.

The spelling of 820724836 in words is "eight hundred twenty million, seven hundred twenty-four thousand, eight hundred thirty-six".