820881044 has 6 divisors (see below), whose sum is σ = 1436541834. Its totient is φ = 410440520.

The previous prime is 820881037. The next prime is 820881053. The reversal of 820881044 is 440188028.

820881044 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 809402500 + 11478544 = 28450^2 + 3388^2 .

It is a junction number, because it is equal to n+sod(n) for n = 820880995 and 820881013.

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, 102610127 + ... + 102610134.

It is an arithmetic number, because the mean of its divisors is an integer number (239423639).

Almost surely, 2^820881044 is an apocalyptic number.

It is an amenable number.

820881044 is a deficient number, since it is larger than the sum of its proper divisors (615660790).

820881044 is a wasteful number, since it uses less digits than its factorization.

820881044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205220265 (or 205220263 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 35.

The square root of 820881044 is about 28651.0216920793. The cubic root of 820881044 is about 936.3252653005.

The spelling of 820881044 in words is "eight hundred twenty million, eight hundred eighty-one thousand, forty-four".