28030320 has 160 divisors (see below), whose sum is σ = 101779200. Its totient is φ = 7070976.

The previous prime is 28030319. The next prime is 28030333. The reversal of 28030320 is 2303082.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 28030293 and 28030302.

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, 40699 + ... + 41381.

It is an arithmetic number, because the mean of its divisors is an integer number (636120).

Almost surely, 2^28030320 is an apocalyptic number.

28030320 is a gapful number since it is divisible by the number (20) 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 28030320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50889600).

28030320 is an abundant number, since it is smaller than the sum of its proper divisors (73748880).

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

28030320 is a wasteful number, since it uses less digits than its factorization.

28030320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724 (or 712 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 28030320 is about 5294.3668176657. The cubic root of 28030320 is about 303.7684640506.

The spelling of 28030320 in words is "twenty-eight million, thirty thousand, three hundred twenty".