28003320 has 192 divisors, whose sum is σ = 98017920. Its totient is φ = 7185024.

The previous prime is 28003319. The next prime is 28003343. The reversal of 28003320 is 2330082.

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 = 28003293 and 28003302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 417927 + ... + 417993.

It is an arithmetic number, because the mean of its divisors is an integer number (510510).

Almost surely, 2^28003320 is an apocalyptic number.

28003320 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 28003320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49008960).

28003320 is an abundant number, since it is smaller than the sum of its proper divisors (70014600).

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

28003320 is a wasteful number, since it uses less digits than its factorization.

28003320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136 (or 120 counting only the distinct ones).

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

The square root of 28003320 is about 5291.8163233431. The cubic root of 28003320 is about 303.6708984697.

The spelling of 28003320 in words is "twenty-eight million, three thousand, three hundred twenty".