28686305 has 8 divisors (see below), whose sum is σ = 34468800. Its totient is φ = 22918896.

The previous prime is 28686271. The next prime is 28686367. The reversal of 28686305 is 50368682.

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 28686305 - 2¹² = 28682209 is a prime.

It is a Curzon 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, 956 + ... + 7634.

It is an arithmetic number, because the mean of its divisors is an integer number (4308600).

Almost surely, 2^28686305 is an apocalyptic number.

It is an amenable number.

28686305 is a deficient number, since it is larger than the sum of its proper divisors (5782495).

28686305 is an equidigital number, since it uses as much as digits as its factorization.

28686305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7543.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 28686305 is about 5355.9597645987. The cubic root of 28686305 is about 306.1198819723.

The spelling of 28686305 in words is "twenty-eight million, six hundred eighty-six thousand, three hundred five".