28478208 has 72 divisors (see below), whose sum is σ = 82708416. Its totient is φ = 8627200.

The previous prime is 28478201. The next prime is 28478237. The reversal of 28478208 is 80287482.

It is a super-2 number, since 2×28478208² = 1622016661782528, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28478201) 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, 6763 + ... + 10133.

It is an arithmetic number, because the mean of its divisors is an integer number (1148728).

Almost surely, 2^28478208 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 28478208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41354208).

28478208 is an abundant number, since it is smaller than the sum of its proper divisors (54230208).

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

28478208 is a wasteful number, since it uses less digits than its factorization.

28478208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3401 (or 3387 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 39.

The square root of 28478208 is about 5336.4977279111. The cubic root of 28478208 is about 305.3778636620.

The spelling of 28478208 in words is "twenty-eight million, four hundred seventy-eight thousand, two hundred eight".