85811586 has 32 divisors (see below), whose sum is σ = 197145600. Its totient is φ = 24392016.

The previous prime is 85811569. The next prime is 85811587. The reversal of 85811586 is 68511858.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (85811587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3225 + ... + 13491.

It is an arithmetic number, because the mean of its divisors is an integer number (6160800).

Almost surely, 2^85811586 is an apocalyptic number.

85811586 is an abundant number, since it is smaller than the sum of its proper divisors (111334014).

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

85811586 is a wasteful number, since it uses less digits than its factorization.

85811586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10478.

The product of its digits is 76800, while the sum is 42.

The square root of 85811586 is about 9263.4543233073. The cubic root of 85811586 is about 441.0779115846.

The spelling of 85811586 in words is "eighty-five million, eight hundred eleven thousand, five hundred eighty-six".