28656985 has 16 divisors (see below), whose sum is σ = 41613696. Its totient is φ = 18494208.

The previous prime is 28656983. The next prime is 28657003. The reversal of 28656985 is 58965682.

It is a cyclic number.

It is not a de Polignac number, because 28656985 - 2¹ = 28656983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28656983) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 23487 + ... + 24676.

It is an arithmetic number, because the mean of its divisors is an integer number (2600856).

Almost surely, 2^28656985 is an apocalyptic number.

It is an amenable number.

28656985 is a deficient number, since it is larger than the sum of its proper divisors (12956711).

28656985 is a wasteful number, since it uses less digits than its factorization.

28656985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48192.

The product of its digits is 1036800, while the sum is 49.

The square root of 28656985 is about 5353.2219270268. The cubic root of 28656985 is about 306.0155523444.

The spelling of 28656985 in words is "twenty-eight million, six hundred fifty-six thousand, nine hundred eighty-five".