85642 has 4 divisors (see below), whose sum is σ = 128466. Its totient is φ = 42820.

The previous prime is 85639. The next prime is 85643. The reversal of 85642 is 24658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24658 = 2 ⋅12329.

It can be written as a sum of positive squares in only one way, i.e., 84681 + 961 = 291^2 + 31^2 .

It is not an unprimeable number, because it can be changed into a prime (85643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21409 + ... + 21412.

2⁸⁵⁶⁴² is an apocalyptic number.

85642 is a deficient number, since it is larger than the sum of its proper divisors (42824).

85642 is a wasteful number, since it uses less digits than its factorization.

85642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42823.

The product of its digits is 1920, while the sum is 25.

The square root of 85642 is about 292.6465444867. The cubic root of 85642 is about 44.0787158430.

It can be divided in two parts, 856 and 42, that added together give a palindrome (898).

The spelling of 85642 in words is "eighty-five thousand, six hundred forty-two".