823805780 has 48 divisors (see below), whose sum is σ = 2040923136. Its totient is φ = 273335040.

The previous prime is 823805761. The next prime is 823805783. The reversal of 823805780 is 87508328.

It is a super-2 number, since 2×823805780² = 1357311926322816800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823805783) 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 15 ways as a sum of consecutive naturals, for example, 90569 + ... + 99248.

It is an arithmetic number, because the mean of its divisors is an integer number (42519232).

Almost surely, 2^823805780 is an apocalyptic number.

It is an amenable number.

823805780 is an abundant number, since it is smaller than the sum of its proper divisors (1217117356).

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

823805780 is a wasteful number, since it uses less digits than its factorization.

823805780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189864 (or 189862 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 823805780 is about 28702.0170022945. The cubic root of 823805780 is about 937.4359655226.

The spelling of 823805780 in words is "eight hundred twenty-three million, eight hundred five thousand, seven hundred eighty".