28378448 has 40 divisors (see below), whose sum is σ = 64132800. Its totient is φ = 12159840.

The previous prime is 28378421. The next prime is 28378507. The reversal of 28378448 is 84487382.

It is a junction number, because it is equal to n+sod(n) for n = 28378399 and 28378408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2903 + ... + 8073.

It is an arithmetic number, because the mean of its divisors is an integer number (1603320).

Almost surely, 2^28378448 is an apocalyptic number.

28378448 is a gapful number since it is divisible by the number (28) 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 28378448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32066400).

28378448 is an abundant number, since it is smaller than the sum of its proper divisors (35754352).

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

28378448 is an equidigital number, since it uses as much as digits as its factorization.

28378448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5200 (or 5180 counting only the distinct ones).

The product of its digits is 344064, while the sum is 44.

The square root of 28378448 is about 5327.1425736505. The cubic root of 28378448 is about 305.0208639315.

The spelling of 28378448 in words is "twenty-eight million, three hundred seventy-eight thousand, four hundred forty-eight".