82709665 has 8 divisors (see below), whose sum is σ = 99534888. Its totient is φ = 65978880.

The previous prime is 82709647. The next prime is 82709677. The reversal of 82709665 is 56690728.

It can be written as a sum of positive squares in 4 ways, for example, as 3873024 + 78836641 = 1968^2 + 8879^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 82709665 - 2¹⁷ = 82578593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21666 + ... + 25195.

It is an arithmetic number, because the mean of its divisors is an integer number (12441861).

Almost surely, 2^82709665 is an apocalyptic number.

It is an amenable number.

82709665 is a deficient number, since it is larger than the sum of its proper divisors (16825223).

82709665 is a wasteful number, since it uses less digits than its factorization.

82709665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47219.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 82709665 is about 9094.4854169986. The cubic root of 82709665 is about 435.6978537461.

The spelling of 82709665 in words is "eighty-two million, seven hundred nine thousand, six hundred sixty-five".