28708285 has 8 divisors (see below), whose sum is σ = 34837560. Its totient is φ = 22708224.

The previous prime is 28708243. The next prime is 28708313. The reversal of 28708285 is 58280782.

It can be written as a sum of positive squares in 4 ways, for example, as 121 + 28708164 = 11^2 + 5358^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28708285 - 2⁹ = 28707773 is a prime.

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, 31812 + ... + 32701.

It is an arithmetic number, because the mean of its divisors is an integer number (4354695).

Almost surely, 2^28708285 is an apocalyptic number.

It is an amenable number.

28708285 is a deficient number, since it is larger than the sum of its proper divisors (6129275).

28708285 is an equidigital number, since it uses as much as digits as its factorization.

28708285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64607.

The product of its (nonzero) digits is 71680, while the sum is 40.

The square root of 28708285 is about 5358.0112915148. The cubic root of 28708285 is about 306.1980469971.

The spelling of 28708285 in words is "twenty-eight million, seven hundred eight thousand, two hundred eighty-five".