82705685 has 4 divisors (see below), whose sum is σ = 99246828. Its totient is φ = 66164544.

The previous prime is 82705681. The next prime is 82705687. The reversal of 82705685 is 58650728.

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 38056561 + 44649124 = 6169^2 + 6682^2 .

It is a cyclic number.

It is not a de Polignac number, because 82705685 - 2² = 82705681 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82705681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8270564 + ... + 8270573.

It is an arithmetic number, because the mean of its divisors is an integer number (24811707).

Almost surely, 2^82705685 is an apocalyptic number.

It is an amenable number.

82705685 is a deficient number, since it is larger than the sum of its proper divisors (16541143).

82705685 is a wasteful number, since it uses less digits than its factorization.

82705685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16541142.

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 82705685 is about 9094.2666004467. The cubic root of 82705685 is about 435.6908650213.

The spelling of 82705685 in words is "eighty-two million, seven hundred five thousand, six hundred eighty-five".