85171830 has 32 divisors (see below), whose sum is σ = 205244928. Its totient is φ = 22620000.

The previous prime is 85171789. The next prime is 85171841. The reversal of 85171830 is 3817158.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 85171791 and 85171800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1875 + ... + 13185.

It is an arithmetic number, because the mean of its divisors is an integer number (6413904).

Almost surely, 2^85171830 is an apocalyptic number.

85171830 is an abundant number, since it is smaller than the sum of its proper divisors (120073098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85171830 is a wasteful number, since it uses less digits than its factorization.

85171830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11572.

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 85171830 is about 9228.8585426368. The cubic root of 85171830 is about 439.9790451453.

Adding to 85171830 its reverse (3817158), we get a palindrome (88988988).

The spelling of 85171830 in words is "eighty-five million, one hundred seventy-one thousand, eight hundred thirty".