28227212 has 12 divisors (see below), whose sum is σ = 53197536. Its totient is φ = 13027920.

The previous prime is 28227211. The next prime is 28227239. The reversal of 28227212 is 21272282.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (28227211) 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, 271364 + ... + 271467.

It is an arithmetic number, because the mean of its divisors is an integer number (4433128).

Almost surely, 2^28227212 is an apocalyptic number.

It is an amenable number.

28227212 is a deficient number, since it is larger than the sum of its proper divisors (24970324).

28227212 is a wasteful number, since it uses less digits than its factorization.

28227212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542848 (or 542846 counting only the distinct ones).

The product of its digits is 1792, while the sum is 26.

The square root of 28227212 is about 5312.9287591685. The cubic root of 28227212 is about 304.4780538233.

Adding to 28227212 its reverse (21272282), we get a palindrome (49499494).

The spelling of 28227212 in words is "twenty-eight million, two hundred twenty-seven thousand, two hundred twelve".