28028224 has 28 divisors (see below), whose sum is σ = 63565024. Its totient is φ = 12011904.

The previous prime is 28028213. The next prime is 28028227. The reversal of 28028224 is 42282082.

It is a tau number, because it is divible by the number of its divisors (28).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 28028192 and 28028201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28028227) 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, 30834 + ... + 31729.

Almost surely, 2^28028224 is an apocalyptic number.

It is an amenable number.

28028224 is an abundant number, since it is smaller than the sum of its proper divisors (35536800).

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

28028224 is an equidigital number, since it uses as much as digits as its factorization.

28028224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62582 (or 62572 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 28028224 is about 5294.1688677261. The cubic root of 28028224 is about 303.7608923143.

It can be divided in two parts, 2802 and 8224, that added together give a triangular number (11026 = T₁₄₈).

The spelling of 28028224 in words is "twenty-eight million, twenty-eight thousand, two hundred twenty-four".