216765085 has 8 divisors (see below), whose sum is σ = 260255160. Its totient is φ = 173320704.

The previous prime is 216765083. The next prime is 216765097. The reversal of 216765085 is 580567612.

It can be written as a sum of positive squares in 4 ways, for example, as 39262756 + 177502329 = 6266^2 + 13323^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 216765085 - 2¹ = 216765083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216765083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69 + ... + 20821.

It is an arithmetic number, because the mean of its divisors is an integer number (32531895).

Almost surely, 2^216765085 is an apocalyptic number.

It is an amenable number.

216765085 is a deficient number, since it is larger than the sum of its proper divisors (43490075).

216765085 is a wasteful number, since it uses less digits than its factorization.

216765085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22847.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 216765085 is about 14722.9441688814. The cubic root of 216765085 is about 600.7075772664.

The spelling of 216765085 in words is "two hundred sixteen million, seven hundred sixty-five thousand, eighty-five".