28305645 has 16 divisors (see below), whose sum is σ = 45427200. Its totient is φ = 15050304.

The previous prime is 28305631. The next prime is 28305671. The reversal of 28305645 is 54650382.

It is not a de Polignac number, because 28305645 - 2⁶ = 28305581 is a prime.

It is a super-3 number, since 3×28305645³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2532 + ... + 7938.

It is an arithmetic number, because the mean of its divisors is an integer number (2839200).

Almost surely, 2^28305645 is an apocalyptic number.

It is an amenable number.

28305645 is a deficient number, since it is larger than the sum of its proper divisors (17121555).

28305645 is a wasteful number, since it uses less digits than its factorization.

28305645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5764.

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 28305645 is about 5320.3049724616. The cubic root of 28305645 is about 304.7598037216.

The spelling of 28305645 in words is "twenty-eight million, three hundred five thousand, six hundred forty-five".