28319808 has 168 divisors, whose sum is σ = 87562944. Its totient is φ = 8053760.

The previous prime is 28319789. The next prime is 28319813. The reversal of 28319808 is 80891382.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 534310 + ... + 534362.

It is an arithmetic number, because the mean of its divisors is an integer number (521208).

Almost surely, 2^28319808 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 28319808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43781472).

28319808 is an abundant number, since it is smaller than the sum of its proper divisors (59243136).

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

28319808 is a wasteful number, since it uses less digits than its factorization.

28319808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 92 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 28319808 is about 5321.6358387248. The cubic root of 28319808 is about 304.8106250731.

The spelling of 28319808 in words is "twenty-eight million, three hundred nineteen thousand, eight hundred eight".