85091636 has 18 divisors (see below), whose sum is σ = 173222658. Its totient is φ = 36467760.

The previous prime is 85091623. The next prime is 85091639. The reversal of 85091636 is 63619058.

It can be written as a sum of positive squares in only one way, i.e., 46104100 + 38987536 = 6790^2 + 6244^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 85091636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85091639) 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 5 ways as a sum of consecutive naturals, for example, 216875 + ... + 217266.

It is an arithmetic number, because the mean of its divisors is an integer number (9623481).

Almost surely, 2^85091636 is an apocalyptic number.

It is an amenable number.

85091636 is an abundant number, since it is smaller than the sum of its proper divisors (88131022).

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

85091636 is a wasteful number, since it uses less digits than its factorization.

85091636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434159 (or 434150 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 85091636 is about 9224.5127784615. The cubic root of 85091636 is about 439.8409135620.

The spelling of 85091636 in words is "eighty-five million, ninety-one thousand, six hundred thirty-six".