85640212 has 12 divisors (see below), whose sum is σ = 171280480. Its totient is φ = 36702936.

The previous prime is 85640189. The next prime is 85640213. The reversal of 85640212 is 21204658.

85640212 is an admirable number.

It is a super-2 number, since 2×85640212² = 14668491822809888, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 3058579 = 85640212 / (8 + 5 + 6 + 4 + 0 + 2 + 1 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85640213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1529262 + ... + 1529317.

Almost surely, 2^85640212 is an apocalyptic number.

It is an amenable number.

85640212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

85640212 is a wasteful number, since it uses less digits than its factorization.

85640212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3058590 (or 3058588 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 85640212 is about 9254.1996952735. The cubic root of 85640212 is about 440.7840908814.

The spelling of 85640212 in words is "eighty-five million, six hundred forty thousand, two hundred twelve".