28438224 has 20 divisors (see below), whose sum is σ = 73465536. Its totient is φ = 9479392.

The previous prime is 28438213. The next prime is 28438247. The reversal of 28438224 is 42283482.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 296184 + ... + 296279.

Almost surely, 2^28438224 is an apocalyptic number.

28438224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28438224 is an abundant number, since it is smaller than the sum of its proper divisors (45027312).

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

28438224 is a wasteful number, since it uses less digits than its factorization.

28438224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592474 (or 592468 counting only the distinct ones).

The product of its digits is 24576, while the sum is 33.

The square root of 28438224 is about 5332.7501347804. The cubic root of 28438224 is about 305.2348777523.

The spelling of 28438224 in words is "twenty-eight million, four hundred thirty-eight thousand, two hundred twenty-four".