28372224 has 36 divisors (see below), whose sum is σ = 75513536. Its totient is φ = 9457152.

The previous prime is 28372193. The next prime is 28372243. The reversal of 28372224 is 42227382.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28372191 and 28372200.

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, 17704 + ... + 19239.

Almost surely, 2^28372224 is an apocalyptic number.

28372224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28372224 is an abundant number, since it is smaller than the sum of its proper divisors (47141312).

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

28372224 is an equidigital number, since it uses as much as digits as its factorization.

28372224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36962 (or 36948 counting only the distinct ones).

The product of its digits is 10752, while the sum is 30.

The square root of 28372224 is about 5326.5583635214. The cubic root of 28372224 is about 304.9985631035.

The spelling of 28372224 in words is "twenty-eight million, three hundred seventy-two thousand, two hundred twenty-four".