28223454 has 64 divisors (see below), whose sum is σ = 68014080. Its totient is φ = 7637760.

The previous prime is 28223389. The next prime is 28223473. The reversal of 28223454 is 45432282.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68802 + ... + 69210.

It is an arithmetic number, because the mean of its divisors is an integer number (1062720).

Almost surely, 2^28223454 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28223454, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34007040).

28223454 is an abundant number, since it is smaller than the sum of its proper divisors (39790626).

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

28223454 is a wasteful number, since it uses less digits than its factorization.

28223454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505.

The product of its digits is 15360, while the sum is 30.

The square root of 28223454 is about 5312.5750818224. The cubic root of 28223454 is about 304.4645411025.

The spelling of 28223454 in words is "twenty-eight million, two hundred twenty-three thousand, four hundred fifty-four".