705808866 has 64 divisors (see below), whose sum is σ = 1690564608. Its totient is φ = 192073728.

The previous prime is 705808861. The next prime is 705808867. The reversal of 705808866 is 668808507.

It is a happy number.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (705808861) 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 31 ways as a sum of consecutive naturals, for example, 246841 + ... + 249683.

It is an arithmetic number, because the mean of its divisors is an integer number (26415072).

Almost surely, 2^705808866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 705808866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (845282304).

705808866 is an abundant number, since it is smaller than the sum of its proper divisors (984755742).

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

705808866 is a wasteful number, since it uses less digits than its factorization.

705808866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3135.

The product of its (nonzero) digits is 645120, while the sum is 48.

The square root of 705808866 is about 26567.0635562156. The cubic root of 705808866 is about 890.3532940686.

It can be divided in two parts, 70 and 5808866, that added together give a triangular number (5808936 = T₃₄₀₈).

The spelling of 705808866 in words is "seven hundred five million, eight hundred eight thousand, eight hundred sixty-six".