28315985 has 8 divisors (see below), whose sum is σ = 35767680. Its totient is φ = 21460464.

The previous prime is 28315979. The next prime is 28315997. The reversal of 28315985 is 58951382.

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 28315985 - 2¹⁰ = 28314961 is a prime.

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, 148937 + ... + 149126.

It is an arithmetic number, because the mean of its divisors is an integer number (4470960).

Almost surely, 2^28315985 is an apocalyptic number.

It is an amenable number.

28315985 is a deficient number, since it is larger than the sum of its proper divisors (7451695).

28315985 is a wasteful number, since it uses less digits than its factorization.

28315985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298087.

The product of its digits is 86400, while the sum is 41.

The square root of 28315985 is about 5321.2766325385. The cubic root of 28315985 is about 304.7969086023.

The spelling of 28315985 in words is "twenty-eight million, three hundred fifteen thousand, nine hundred eighty-five".