28221112 has 8 divisors (see below), whose sum is σ = 52914600. Its totient is φ = 14110552.

The previous prime is 28221107. The next prime is 28221113. The reversal of 28221112 is 21112282.

It is a tau number, because it is divible by the number of its divisors (8).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 28221112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28221113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1763812 + ... + 1763827.

It is an arithmetic number, because the mean of its divisors is an integer number (6614325).

Almost surely, 2^28221112 is an apocalyptic number.

It is an amenable number.

28221112 is a deficient number, since it is larger than the sum of its proper divisors (24693488).

28221112 is a wasteful number, since it uses less digits than its factorization.

28221112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3527645 (or 3527641 counting only the distinct ones).

The product of its digits is 128, while the sum is 19.

The square root of 28221112 is about 5312.3546568353. The cubic root of 28221112 is about 304.4561193164.

Adding to 28221112 its reverse (21112282), we get a palindrome (49333394).

The spelling of 28221112 in words is "twenty-eight million, two hundred twenty-one thousand, one hundred twelve".