28299685 has 4 divisors (see below), whose sum is σ = 33959628. Its totient is φ = 22639744.

The previous prime is 28299673. The next prime is 28299697. The reversal of 28299685 is 58699282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58699282 = 2 ⋅29349641.

It is an interprime number because it is at equal distance from previous prime (28299673) and next prime (28299697).

It can be written as a sum of positive squares in 2 ways, for example, as 15100996 + 13198689 = 3886^2 + 3633^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28299685 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2829964 + ... + 2829973.

It is an arithmetic number, because the mean of its divisors is an integer number (8489907).

Almost surely, 2^28299685 is an apocalyptic number.

It is an amenable number.

28299685 is a deficient number, since it is larger than the sum of its proper divisors (5659943).

28299685 is an equidigital number, since it uses as much as digits as its factorization.

28299685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5659942.

The product of its digits is 622080, while the sum is 49.

The square root of 28299685 is about 5319.7448247073. The cubic root of 28299685 is about 304.7384122768.

The spelling of 28299685 in words is "twenty-eight million, two hundred ninety-nine thousand, six hundred eighty-five".