811220859684 has 81 divisors (see below), whose sum is σ = 2099984676699. Its totient is φ = 264042762480.

The previous prime is 811220859679. The next prime is 811220859763. The reversal of 811220859684 is 486958022118.

The square root of 811220859684 is 900678.

It is a perfect power (a square), and thus also a powerful number.

It is a self number, because there is not a number n which added to its sum of digits gives 811220859684.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 232373179 + ... + 232376669.

Almost surely, 2^811220859684 is an apocalyptic number.

811220859684 is the 900678-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 811220859684

811220859684 is an abundant number, since it is smaller than the sum of its proper divisors (1288763817015).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

811220859684 is an equidigital number, since it uses as much as digits as its factorization.

811220859684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7078 (or 3539 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 54.

The spelling of 811220859684 in words is "eight hundred eleven billion, two hundred twenty million, eight hundred fifty-nine thousand, six hundred eighty-four".