28227312 has 120 divisors (see below), whose sum is σ = 85984080. Its totient is φ = 8864640.

The previous prime is 28227299. The next prime is 28227347. The reversal of 28227312 is 21372282.

It is a happy number.

It is a super-2 number, since 2×28227312² = 1593562285490688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 155862 + ... + 156042.

It is an arithmetic number, because the mean of its divisors is an integer number (716534).

Almost surely, 2^28227312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28227312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42992040).

28227312 is an abundant number, since it is smaller than the sum of its proper divisors (57756768).

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

28227312 is a wasteful number, since it uses less digits than its factorization.

28227312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 205 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 28227312 is about 5312.9381701654. The cubic root of 28227312 is about 304.4784133791.

Adding to 28227312 its reverse (21372282), we get a palindrome (49599594).

The spelling of 28227312 in words is "twenty-eight million, two hundred twenty-seven thousand, three hundred twelve".