28283287 has 4 divisors (see below), whose sum is σ = 28452816. Its totient is φ = 28113760.

The previous prime is 28283263. The next prime is 28283327. The reversal of 28283287 is 78238282.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28283287 - 2⁷ = 28283159 is a prime.

It is a Smith number, since the sum of its digits (40) 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 not an unprimeable number, because it can be changed into a prime (28283587) 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, 84514 + ... + 84847.

It is an arithmetic number, because the mean of its divisors is an integer number (7113204).

Almost surely, 2^28283287 is an apocalyptic number.

28283287 is a deficient number, since it is larger than the sum of its proper divisors (169529).

28283287 is a wasteful number, since it uses less digits than its factorization.

28283287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169528.

The product of its digits is 86016, while the sum is 40.

The square root of 28283287 is about 5318.2033620387. The cubic root of 28283287 is about 304.6795415866.

The spelling of 28283287 in words is "twenty-eight million, two hundred eighty-three thousand, two hundred eighty-seven".