28013585 has 8 divisors (see below), whose sum is σ = 33648936. Its totient is φ = 22389120.

The previous prime is 28013567. The next prime is 28013591. The reversal of 28013585 is 58531082.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2531281 + 25482304 = 1591^2 + 5048^2 .

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

It is not a de Polignac number, because 28013585 - 2¹⁴ = 27997201 is a prime.

It is a Duffinian number.

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, 4877 + ... + 8933.

It is an arithmetic number, because the mean of its divisors is an integer number (4206117).

Almost surely, 2^28013585 is an apocalyptic number.

It is an amenable number.

28013585 is a deficient number, since it is larger than the sum of its proper divisors (5635351).

28013585 is a wasteful number, since it uses less digits than its factorization.

28013585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5443.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 28013585 is about 5292.7861283071. The cubic root of 28013585 is about 303.7079988440.

The spelling of 28013585 in words is "twenty-eight million, thirteen thousand, five hundred eighty-five".