28520448 has 104 divisors (see below), whose sum is σ = 83351616. Its totient is φ = 8601600.

The previous prime is 28520447. The next prime is 28520449. The reversal of 28520448 is 84402582.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28520447) and next prime (28520449).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28520447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135063 + ... + 135273.

Almost surely, 2^28520448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28520448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41675808).

28520448 is an abundant number, since it is smaller than the sum of its proper divisors (54831168).

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

28520448 is a wasteful number, since it uses less digits than its factorization.

28520448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 33.

The square root of 28520448 is about 5340.4539132924. The cubic root of 28520448 is about 305.5287719015.

The spelling of 28520448 in words is "twenty-eight million, five hundred twenty thousand, four hundred forty-eight".