805766 has 16 divisors (see below), whose sum is σ = 1378944. Its totient is φ = 349824.

The previous prime is 805757. The next prime is 805789. The reversal of 805766 is 667508.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

805766 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 470 + ... + 1353.

It is an arithmetic number, because the mean of its divisors is an integer number (86184).

2⁸⁰⁵⁷⁶⁶ is an apocalyptic number.

805766 is a deficient number, since it is larger than the sum of its proper divisors (573178).

805766 is a wasteful number, since it uses less digits than its factorization.

805766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1855.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 805766 is about 897.6446958569. The cubic root of 805766 is about 93.0542713254.

It can be divided in two parts, 80 and 5766, that multiplied together give a triangular number (461280 = T₉₆₀).

The spelling of 805766 in words is "eight hundred five thousand, seven hundred sixty-six".