28222212 has 24 divisors (see below), whose sum is σ = 65949856. Its totient is φ = 9393408.

The previous prime is 28222177. The next prime is 28222217. The reversal of 28222212 is 21222282.

It is not an unprimeable number, because it can be changed into a prime (28222217) 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, 9588 + ... + 12180.

Almost surely, 2^28222212 is an apocalyptic number.

It is an amenable number.

28222212 is an abundant number, since it is smaller than the sum of its proper divisors (37727644).

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

28222212 is a wasteful number, since it uses less digits than its factorization.

28222212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3507 (or 3505 counting only the distinct ones).

The product of its digits is 512, while the sum is 21.

The square root of 28222212 is about 5312.4581880708. The cubic root of 28222212 is about 304.4600749528.

Adding to 28222212 its reverse (21222282), we get a palindrome (49444494).

The spelling of 28222212 in words is "twenty-eight million, two hundred twenty-two thousand, two hundred twelve".