28224420 has 192 divisors, whose sum is σ = 98703360. Its totient is φ = 5879808.

The previous prime is 28224407. The next prime is 28224421. The reversal of 28224420 is 2442282.

It is not an unprimeable number, because it can be changed into a prime (28224421) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 421227 + ... + 421293.

It is an arithmetic number, because the mean of its divisors is an integer number (514080).

Almost surely, 2^28224420 is an apocalyptic number.

28224420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28224420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49351680).

28224420 is an abundant number, since it is smaller than the sum of its proper divisors (70478940).

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

28224420 is a wasteful number, since it uses less digits than its factorization.

28224420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

The square root of 28224420 is about 5312.6659974066. The cubic root of 28224420 is about 304.4680146838.

The spelling of 28224420 in words is "twenty-eight million, two hundred twenty-four thousand, four hundred twenty".