85009140 has 36 divisors (see below), whose sum is σ = 257861604. Its totient is φ = 22669056.

The previous prime is 85009139. The next prime is 85009159. The reversal of 85009140 is 4190058.

It can be written as a sum of positive squares in 2 ways, for example, as 17539344 + 67469796 = 4188^2 + 8214^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 235957 + ... + 236316.

Almost surely, 2^85009140 is an apocalyptic number.

It is an amenable number.

85009140 is an abundant number, since it is smaller than the sum of its proper divisors (172852464).

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

85009140 is a wasteful number, since it uses less digits than its factorization.

85009140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472288 (or 472283 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 85009140 is about 9220.0401300645. The cubic root of 85009140 is about 439.6987262679.

Adding to 85009140 its reverse (4190058), we get a palindrome (89199198).

The spelling of 85009140 in words is "eighty-five million, nine thousand, one hundred forty".