85211640 has 48 divisors (see below), whose sum is σ = 276939000. Its totient is φ = 22723008.

The previous prime is 85211627. The next prime is 85211641. The reversal of 85211640 is 4611258.

85211640 is a `hidden beast` number, since 8 + 5 + 2 + 11 + 640 = 666.

It is a super-2 number, since 2×85211640² = 14522047182979200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85211641) 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, 117990 + ... + 118709.

Almost surely, 2^85211640 is an apocalyptic number.

It is an amenable number.

85211640 is an abundant number, since it is smaller than the sum of its proper divisors (191727360).

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

85211640 is a wasteful number, since it uses less digits than its factorization.

85211640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236716 (or 236709 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 85211640 is about 9231.0151121098. The cubic root of 85211640 is about 440.0475843854.

Adding to 85211640 its reverse (4611258), we get a palindrome (89822898).

The spelling of 85211640 in words is "eighty-five million, two hundred eleven thousand, six hundred forty".