28305312 has 96 divisors (see below), whose sum is σ = 86228352. Its totient is φ = 7962624.

The previous prime is 28305227. The next prime is 28305313. The reversal of 28305312 is 21350382.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (28305313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48768 + ... + 49344.

It is an arithmetic number, because the mean of its divisors is an integer number (898212).

Almost surely, 2^28305312 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 28305312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43114176).

28305312 is an abundant number, since it is smaller than the sum of its proper divisors (57923040).

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

28305312 is a wasteful number, since it uses less digits than its factorization.

28305312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670 (or 662 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 28305312 is about 5320.2736771711. The cubic root of 28305312 is about 304.7586086077.

Adding to 28305312 its reverse (21350382), we get a palindrome (49655694).

The spelling of 28305312 in words is "twenty-eight million, three hundred five thousand, three hundred twelve".