805084820 has 24 divisors (see below), whose sum is σ = 1692032328. Its totient is φ = 321776000.

The previous prime is 805084781. The next prime is 805084823. The reversal of 805084820 is 28480508.

It can be written as a sum of positive squares in 4 ways, for example, as 21196816 + 783888004 = 4604^2 + 27998^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805084823) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10550 + ... + 41490.

It is an arithmetic number, because the mean of its divisors is an integer number (70501347).

Almost surely, 2^805084820 is an apocalyptic number.

It is an amenable number.

805084820 is an abundant number, since it is smaller than the sum of its proper divisors (886947508).

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

805084820 is a wasteful number, since it uses less digits than its factorization.

805084820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32251 (or 32249 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 35.

The square root of 805084820 is about 28374.0166349426. The cubic root of 805084820 is about 930.2804180015.

The spelling of 805084820 in words is "eight hundred five million, eighty-four thousand, eight hundred twenty".