28556985 has 16 divisors (see below), whose sum is σ = 46206720. Its totient is φ = 15058560.

The previous prime is 28556977. The next prime is 28556989. The reversal of 28556985 is 58965582.

It is not a de Polignac number, because 28556985 - 2³ = 28556977 is a prime.

It is a super-3 number, since 3×28556985³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28556989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9361 + ... + 12030.

It is an arithmetic number, because the mean of its divisors is an integer number (2887920).

Almost surely, 2^28556985 is an apocalyptic number.

It is an amenable number.

28556985 is a deficient number, since it is larger than the sum of its proper divisors (17649735).

28556985 is a wasteful number, since it uses less digits than its factorization.

28556985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21488.

The product of its digits is 864000, while the sum is 48.

The square root of 28556985 is about 5343.8735950619. The cubic root of 28556985 is about 305.6591852478.

The spelling of 28556985 in words is "twenty-eight million, five hundred fifty-six thousand, nine hundred eighty-five".