28585985 has 8 divisors (see below), whose sum is σ = 34391976. Its totient is φ = 22809600.

The previous prime is 28585981. The next prime is 28586017. The reversal of 28585985 is 58958582.

It can be written as a sum of positive squares in 4 ways, for example, as 14508481 + 14077504 = 3809^2 + 3752^2 .

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

It is not a de Polignac number, because 28585985 - 2² = 28585981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28585981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5216 + ... + 9185.

It is an arithmetic number, because the mean of its divisors is an integer number (4298997).

Almost surely, 2^28585985 is an apocalyptic number.

It is an amenable number.

28585985 is a deficient number, since it is larger than the sum of its proper divisors (5805991).

28585985 is a wasteful number, since it uses less digits than its factorization.

28585985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14803.

The product of its digits is 1152000, while the sum is 50.

The square root of 28585985 is about 5346.5862940759. The cubic root of 28585985 is about 305.7626172396.

The spelling of 28585985 in words is "twenty-eight million, five hundred eighty-five thousand, nine hundred eighty-five".