28224894 has 8 divisors (see below), whose sum is σ = 56449800. Its totient is φ = 9408296.

The previous prime is 28224881. The next prime is 28224901. The reversal of 28224894 is 49842282.

It is a sphenic number, since it is the product of 3 distinct primes.

28224894 is an admirable number.

It is a super-2 number, since 2×28224894² = 1593289282622472, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 2352069 + ... + 2352080.

It is an arithmetic number, because the mean of its divisors is an integer number (7056225).

Almost surely, 2^28224894 is an apocalyptic number.

28224894 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28224894 is a wasteful number, since it uses less digits than its factorization.

28224894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4704154.

The product of its digits is 73728, while the sum is 39.

The square root of 28224894 is about 5312.7106075901. The cubic root of 28224894 is about 304.4697190830.

The spelling of 28224894 in words is "twenty-eight million, two hundred twenty-four thousand, eight hundred ninety-four".