805969826820 has 144 divisors (see below), whose sum is σ = 2453620286208. Its totient is φ = 214148551680.

The previous prime is 805969826791. The next prime is 805969826899. The reversal of 805969826820 is 28628969508.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 121983957 + ... + 121990563.

Almost surely, 2^805969826820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 805969826820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1226810143104).

805969826820 is an abundant number, since it is smaller than the sum of its proper divisors (1647650459388).

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

805969826820 is a wasteful number, since it uses less digits than its factorization.

805969826820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8970 (or 8965 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 63.

The spelling of 805969826820 in words is "eight hundred five billion, nine hundred sixty-nine million, eight hundred twenty-six thousand, eight hundred twenty".