85809812 has 36 divisors (see below), whose sum is σ = 174785940. Its totient is φ = 36706560.

The previous prime is 85809793. The next prime is 85809817. The reversal of 85809812 is 21890858.

It can be written as a sum of positive squares in 2 ways, for example, as 78605956 + 7203856 = 8866^2 + 2684^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 85809812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85809817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3014 + ... + 13442.

It is an arithmetic number, because the mean of its divisors is an integer number (4855165).

Almost surely, 2^85809812 is an apocalyptic number.

It is an amenable number.

85809812 is an abundant number, since it is smaller than the sum of its proper divisors (88976128).

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

85809812 is a wasteful number, since it uses less digits than its factorization.

85809812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10472 (or 10459 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 41.

The square root of 85809812 is about 9263.3585701947. The cubic root of 85809812 is about 441.0748720665.

The spelling of 85809812 in words is "eighty-five million, eight hundred nine thousand, eight hundred twelve".