28320084 has 96 divisors (see below), whose sum is σ = 82602240. Its totient is φ = 8325504.

The previous prime is 28320041. The next prime is 28320091. The reversal of 28320084 is 48002382.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31854 + ... + 32730.

It is an arithmetic number, because the mean of its divisors is an integer number (860440).

Almost surely, 2^28320084 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 28320084, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41301120).

28320084 is an abundant number, since it is smaller than the sum of its proper divisors (54282156).

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

28320084 is a wasteful number, since it uses less digits than its factorization.

28320084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926 (or 918 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 28320084 is about 5321.6617705375. The cubic root of 28320084 is about 304.8116152806.

The spelling of 28320084 in words is "twenty-eight million, three hundred twenty thousand, eighty-four".