28305318 has 16 divisors (see below), whose sum is σ = 59072256. Its totient is φ = 9024840.

The previous prime is 28305313. The next prime is 28305349. The reversal of 28305318 is 81350382.

It is a happy number.

It is a super-2 number, since 2×28305318² = 1602382054162248, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102418 + ... + 102693.

It is an arithmetic number, because the mean of its divisors is an integer number (3692016).

Almost surely, 2^28305318 is an apocalyptic number.

28305318 is an abundant number, since it is smaller than the sum of its proper divisors (30766938).

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

28305318 is a wasteful number, since it uses less digits than its factorization.

28305318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205139.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 28305318 is about 5320.2742410519. The cubic root of 28305318 is about 304.7586301414.

The spelling of 28305318 in words is "twenty-eight million, three hundred five thousand, three hundred eighteen".