215732085 has 16 divisors (see below), whose sum is σ = 345643200. Its totient is φ = 114899840.

The previous prime is 215732071. The next prime is 215732093. The reversal of 215732085 is 580237512.

215732085 = 105² + 106² + ... + 865².

It is not a de Polignac number, because 215732085 - 2⁸ = 215731829 is a prime.

It is a super-4 number, since 4×215732085⁴ (a number of 34 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1966 + ... + 20864.

It is an arithmetic number, because the mean of its divisors is an integer number (21602700).

Almost surely, 2^215732085 is an apocalyptic number.

It is an amenable number.

215732085 is a deficient number, since it is larger than the sum of its proper divisors (129911115).

215732085 is a wasteful number, since it uses less digits than its factorization.

215732085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19668.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 215732085 is about 14687.8209752162. The cubic root of 215732085 is about 599.7518279207.

Adding to 215732085 its reverse (580237512), we get a palindrome (795969597).

The spelling of 215732085 in words is "two hundred fifteen million, seven hundred thirty-two thousand, eighty-five".