85785218 has 4 divisors (see below), whose sum is σ = 128677830. Its totient is φ = 42892608.

The previous prime is 85785173. The next prime is 85785223. The reversal of 85785218 is 81258758.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 79619929 + 6165289 = 8923^2 + 2483^2 .

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 as a sum of consecutive naturals, namely, 21446303 + ... + 21446306.

Almost surely, 2^85785218 is an apocalyptic number.

85785218 is a deficient number, since it is larger than the sum of its proper divisors (42892612).

85785218 is a wasteful number, since it uses less digits than its factorization.

85785218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42892611.

The product of its digits is 179200, while the sum is 44.

The square root of 85785218 is about 9262.0309867761. The cubic root of 85785218 is about 441.0327291317.

The spelling of 85785218 in words is "eighty-five million, seven hundred eighty-five thousand, two hundred eighteen".