28368785 has 4 divisors (see below), whose sum is σ = 34042548. Its totient is φ = 22695024.

The previous prime is 28368731. The next prime is 28368787. The reversal of 28368785 is 58786382.

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 14737921 + 13630864 = 3839^2 + 3692^2 .

It is a cyclic number.

It is not a de Polignac number, because 28368785 - 2¹⁰ = 28367761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28368787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2836874 + ... + 2836883.

It is an arithmetic number, because the mean of its divisors is an integer number (8510637).

Almost surely, 2^28368785 is an apocalyptic number.

It is an amenable number.

28368785 is a deficient number, since it is larger than the sum of its proper divisors (5673763).

28368785 is an equidigital number, since it uses as much as digits as its factorization.

28368785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5673762.

The product of its digits is 645120, while the sum is 47.

The square root of 28368785 is about 5326.2355374129. The cubic root of 28368785 is about 304.9862396372.

The spelling of 28368785 in words is "twenty-eight million, three hundred sixty-eight thousand, seven hundred eighty-five".