28035985 has 4 divisors (see below), whose sum is σ = 33643188. Its totient is φ = 22428784.

The previous prime is 28035971. The next prime is 28036003. The reversal of 28035985 is 58953082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58953082 = 2 ⋅29476541.

It can be written as a sum of positive squares in 2 ways, for example, as 7884864 + 20151121 = 2808^2 + 4489^2 .

It is a cyclic number.

It is not a de Polignac number, because 28035985 - 2⁹ = 28035473 is a prime.

It is a super-4 number, since 4×28035985⁴ (a number of 31 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2803594 + ... + 2803603.

It is an arithmetic number, because the mean of its divisors is an integer number (8410797).

Almost surely, 2^28035985 is an apocalyptic number.

It is an amenable number.

28035985 is a deficient number, since it is larger than the sum of its proper divisors (5607203).

28035985 is an equidigital number, since it uses as much as digits as its factorization.

28035985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5607202.

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 28035985 is about 5294.9017932347. The cubic root of 28035985 is about 303.7889268023.

The spelling of 28035985 in words is "twenty-eight million, thirty-five thousand, nine hundred eighty-five".