85639786 has 4 divisors (see below), whose sum is σ = 128459682. Its totient is φ = 42819892.

The previous prime is 85639777. The next prime is 85639811. The reversal of 85639786 is 68793658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68793658 = 2 ⋅34396829.

It can be written as a sum of positive squares in only one way, i.e., 73633561 + 12006225 = 8581^2 + 3465^2 .

It is a super-2 number, since 2×85639786² = 14668345892251592, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21409945 + ... + 21409948.

Almost surely, 2^85639786 is an apocalyptic number.

85639786 is a deficient number, since it is larger than the sum of its proper divisors (42819896).

85639786 is a wasteful number, since it uses less digits than its factorization.

85639786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42819895.

The product of its digits is 2177280, while the sum is 52.

The square root of 85639786 is about 9254.1766786679. The cubic root of 85639786 is about 440.7833600163.

The spelling of 85639786 in words is "eighty-five million, six hundred thirty-nine thousand, seven hundred eighty-six".