28220448 has 48 divisors (see below), whose sum is σ = 77305536. Its totient is φ = 8997120.

The previous prime is 28220443. The next prime is 28220449. The reversal of 28220448 is 84402282.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (28220443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4183 + ... + 8598.

It is an arithmetic number, because the mean of its divisors is an integer number (1610532).

Almost surely, 2^28220448 is an apocalyptic number.

It is an amenable number.

28220448 is an abundant number, since it is smaller than the sum of its proper divisors (49085088).

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

28220448 is a wasteful number, since it uses less digits than its factorization.

28220448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12817 (or 12809 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 30.

The square root of 28220448 is about 5312.2921606403. The cubic root of 28220448 is about 304.4537315006.

The spelling of 28220448 in words is "twenty-eight million, two hundred twenty thousand, four hundred forty-eight".