28027212 has 12 divisors (see below), whose sum is σ = 65396856. Its totient is φ = 9342400.

The previous prime is 28027189. The next prime is 28027213. The reversal of 28027212 is 21272082.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×28027212² = 1571049224985888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28027213) 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 3 ways as a sum of consecutive naturals, for example, 1167789 + ... + 1167812.

It is an arithmetic number, because the mean of its divisors is an integer number (5449738).

Almost surely, 2^28027212 is an apocalyptic number.

It is an amenable number.

28027212 is an abundant number, since it is smaller than the sum of its proper divisors (37369644).

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

28027212 is a wasteful number, since it uses less digits than its factorization.

28027212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2335608 (or 2335606 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 28027212 is about 5294.0732900103. The cubic root of 28027212 is about 303.7572363600.

Adding to 28027212 its reverse (21272082), we get a palindrome (49299294).

The spelling of 28027212 in words is "twenty-eight million, twenty-seven thousand, two hundred twelve".