805778956 has 12 divisors (see below), whose sum is σ = 1411799760. Its totient is φ = 402407600.

The previous prime is 805778899. The next prime is 805778959. The reversal of 805778956 is 659877508.

It is a junction number, because it is equal to n+sod(n) for n = 805778897 and 805778906.

It is not an unprimeable number, because it can be changed into a prime (805778959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116695 + ... + 123406.

It is an arithmetic number, because the mean of its divisors is an integer number (117649980).

Almost surely, 2^805778956 is an apocalyptic number.

It is an amenable number.

805778956 is a deficient number, since it is larger than the sum of its proper divisors (606020804).

805778956 is a wasteful number, since it uses less digits than its factorization.

805778956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240944 (or 240942 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 55.

The square root of 805778956 is about 28386.2458947991. The cubic root of 805778956 is about 930.5477006600.

The spelling of 805778956 in words is "eight hundred five million, seven hundred seventy-eight thousand, nine hundred fifty-six".