821061328 has 20 divisors (see below), whose sum is σ = 1598887620. Its totient is φ = 408445184.

The previous prime is 821061323. The next prime is 821061343. The reversal of 821061328 is 823160128.

It can be written as a sum of positive squares in 2 ways, for example, as 446561424 + 374499904 = 21132^2 + 19352^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 821061328.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821061323) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 127093 + ... + 133396.

It is an arithmetic number, because the mean of its divisors is an integer number (79944381).

Almost surely, 2^821061328 is an apocalyptic number.

It is an amenable number.

821061328 is a deficient number, since it is larger than the sum of its proper divisors (777826292).

821061328 is a wasteful number, since it uses less digits than its factorization.

821061328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260694 (or 260688 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 821061328 is about 28654.1677247831. The cubic root of 821061328 is about 936.3938063350.

The spelling of 821061328 in words is "eight hundred twenty-one million, sixty-one thousand, three hundred twenty-eight".