87665285 has 8 divisors (see below), whose sum is σ = 105265656. Its totient is φ = 70087360.

The previous prime is 87665239. The next prime is 87665299. The reversal of 87665285 is 58256678.

It can be written as a sum of positive squares in 4 ways, for example, as 6791236 + 80874049 = 2606^2 + 8993^2 .

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

It is not a de Polignac number, because 87665285 - 2¹⁰ = 87664261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4715 + ... + 14055.

It is an arithmetic number, because the mean of its divisors is an integer number (13158207).

Almost surely, 2^87665285 is an apocalyptic number.

It is an amenable number.

87665285 is a deficient number, since it is larger than the sum of its proper divisors (17600371).

87665285 is a wasteful number, since it uses less digits than its factorization.

87665285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11223.

The product of its digits is 806400, while the sum is 47.

The square root of 87665285 is about 9362.9741535476. The cubic root of 87665285 is about 444.2313625914.

The spelling of 87665285 in words is "eighty-seven million, six hundred sixty-five thousand, two hundred eighty-five".