85211540 has 24 divisors (see below), whose sum is σ = 179259360. Its totient is φ = 34024608.

The previous prime is 85211519. The next prime is 85211543. The reversal of 85211540 is 4511258.

It is a super-2 number, since 2×85211540² = 14522013098343200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85211543) 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 7 ways as a sum of consecutive naturals, for example, 8939 + ... + 15821.

It is an arithmetic number, because the mean of its divisors is an integer number (7469140).

Almost surely, 2^85211540 is an apocalyptic number.

It is an amenable number.

85211540 is an abundant number, since it is smaller than the sum of its proper divisors (94047820).

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

85211540 is a wasteful number, since it uses less digits than its factorization.

85211540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7511 (or 7509 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 85211540 is about 9231.0096955859. The cubic root of 85211540 is about 440.0474122463.

Adding to 85211540 its reverse (4511258), we get a palindrome (89722798).

The spelling of 85211540 in words is "eighty-five million, two hundred eleven thousand, five hundred forty".