28580785 has 4 divisors (see below), whose sum is σ = 34296948. Its totient is φ = 22864624.

The previous prime is 28580771. The next prime is 28580819. The reversal of 28580785 is 58708582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21939856 + 6640929 = 4684^2 + 2577^2 .

It is a cyclic number.

It is not a de Polignac number, because 28580785 - 2⁵ = 28580753 is a prime.

It is a super-2 number, since 2×28580785² = 1633722542432450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2858074 + ... + 2858083.

It is an arithmetic number, because the mean of its divisors is an integer number (8574237).

Almost surely, 2^28580785 is an apocalyptic number.

It is an amenable number.

28580785 is a deficient number, since it is larger than the sum of its proper divisors (5716163).

28580785 is an equidigital number, since it uses as much as digits as its factorization.

28580785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5716162.

The product of its (nonzero) digits is 179200, while the sum is 43.

The square root of 28580785 is about 5346.0999803595. The cubic root of 28580785 is about 305.7440759623.

The spelling of 28580785 in words is "twenty-eight million, five hundred eighty thousand, seven hundred eighty-five".