28680833 has 4 divisors (see below), whose sum is σ = 28698948. Its totient is φ = 28662720.

The previous prime is 28680829. The next prime is 28680881. The reversal of 28680833 is 33808682.

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 4700224 + 23980609 = 2168^2 + 4897^2 .

It is a cyclic number.

It is not a de Polignac number, because 28680833 - 2² = 28680829 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28680133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6428 + ... + 9933.

It is an arithmetic number, because the mean of its divisors is an integer number (7174737).

Almost surely, 2^28680833 is an apocalyptic number.

It is an amenable number.

28680833 is a deficient number, since it is larger than the sum of its proper divisors (18115).

28680833 is a wasteful number, since it uses less digits than its factorization.

28680833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18114.

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 28680833 is about 5355.4489074213. The cubic root of 28680833 is about 306.1004163014.

The spelling of 28680833 in words is "twenty-eight million, six hundred eighty thousand, eight hundred thirty-three".