28305285 has 8 divisors (see below), whose sum is σ = 45288480. Its totient is φ = 15096144.

The previous prime is 28305227. The next prime is 28305313. The reversal of 28305285 is 58250382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28305285 - 2⁸ = 28305029 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 943495 + ... + 943524.

It is an arithmetic number, because the mean of its divisors is an integer number (5661060).

Almost surely, 2^28305285 is an apocalyptic number.

It is an amenable number.

28305285 is a deficient number, since it is larger than the sum of its proper divisors (16983195).

28305285 is a wasteful number, since it uses less digits than its factorization.

28305285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1887027.

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 28305285 is about 5320.2711397071. The cubic root of 28305285 is about 304.7585117062.

The spelling of 28305285 in words is "twenty-eight million, three hundred five thousand, two hundred eighty-five".