28212224 has 22 divisors (see below), whose sum is σ = 56398944. Its totient is φ = 14105600.

The previous prime is 28212221. The next prime is 28212227. The reversal of 28212224 is 42221282.

It is an interprime number because it is at equal distance from previous prime (28212221) and next prime (28212227).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 28212224.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28212221) 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 as a sum of consecutive naturals, namely, 12752 + ... + 14799.

Almost surely, 2^28212224 is an apocalyptic number.

It is an amenable number.

28212224 is a deficient number, since it is larger than the sum of its proper divisors (28186720).

28212224 is an equidigital number, since it uses as much as digits as its factorization.

28212224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27571 (or 27553 counting only the distinct ones).

The product of its digits is 1024, while the sum is 23.

The square root of 28212224 is about 5311.5180504259. The cubic root of 28212224 is about 304.4241540024.

The spelling of 28212224 in words is "twenty-eight million, two hundred twelve thousand, two hundred twenty-four".