85639784 has 16 divisors (see below), whose sum is σ = 166112100. Its totient is φ = 41343232.

The previous prime is 85639777. The next prime is 85639811. The reversal of 85639784 is 48793658.

It can be written as a sum of positive squares in 2 ways, for example, as 85562500 + 77284 = 9250^2 + 278^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184337 + ... + 184800.

Almost surely, 2^85639784 is an apocalyptic number.

It is an amenable number.

85639784 is a deficient number, since it is larger than the sum of its proper divisors (80472316).

85639784 is a wasteful number, since it uses less digits than its factorization.

85639784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369172 (or 369168 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 50.

The square root of 85639784 is about 9254.1765706085. The cubic root of 85639784 is about 440.7833565850.

The spelling of 85639784 in words is "eighty-five million, six hundred thirty-nine thousand, seven hundred eighty-four".