8210705 has 4 divisors (see below), whose sum is σ = 9852852. Its totient is φ = 6568560.

The previous prime is 8210681. The next prime is 8210723. The reversal of 8210705 is 5070128.

8210705 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5612161 + 2598544 = 2369^2 + 1612^2 .

It is not a de Polignac number, because 8210705 - 2¹⁰ = 8209681 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 821066 + ... + 821075.

It is an arithmetic number, because the mean of its divisors is an integer number (2463213).

Almost surely, 2^8210705 is an apocalyptic number.

It is an amenable number.

8210705 is a deficient number, since it is larger than the sum of its proper divisors (1642147).

8210705 is a wasteful number, since it uses less digits than its factorization.

8210705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642146.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 8210705 is about 2865.4327770862. The cubic root of 8210705 is about 201.7406811931.

The spelling of 8210705 in words is "eight million, two hundred ten thousand, seven hundred five".