85858 has 4 divisors (see below), whose sum is σ = 128790. Its totient is φ = 42928.

The previous prime is 85853. The next prime is 85889.

85858 is nontrivially palindromic in base 10.

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., 85849 + 9 = 293^2 + 3^2 .

It is an alternating number because its digits alternate between even and odd.

85858 is an undulating number in base 10.

It is not an unprimeable number, because it can be changed into a prime (85853) by changing a digit.

85858 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21463 + ... + 21466.

2⁸⁵⁸⁵⁸ is an apocalyptic number.

85858 is a deficient number, since it is larger than the sum of its proper divisors (42932).

85858 is a wasteful number, since it uses less digits than its factorization.

85858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42931.

The product of its digits is 12800, while the sum is 34.

The square root of 85858 is about 293.0153579593. The cubic root of 85858 is about 44.1157421051.

It can be divided in two parts, 8 and 5858, that multiplied together give a palindrome (46864).

The spelling of 85858 in words is "eighty-five thousand, eight hundred fifty-eight".