28287299 has 4 divisors (see below), whose sum is σ = 28300200. Its totient is φ = 28274400.

The previous prime is 28287289. The next prime is 28287341. The reversal of 28287299 is 99278282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99278282 = 2 ⋅49639141.

It is a cyclic number.

It is not a de Polignac number, because 28287299 - 2¹⁶ = 28221763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28287229) 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 3 ways as a sum of consecutive naturals, for example, 2249 + ... + 7850.

It is an arithmetic number, because the mean of its divisors is an integer number (7075050).

Almost surely, 2^28287299 is an apocalyptic number.

28287299 is a deficient number, since it is larger than the sum of its proper divisors (12901).

28287299 is a wasteful number, since it uses less digits than its factorization.

28287299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12900.

The product of its digits is 290304, while the sum is 47.

The square root of 28287299 is about 5318.5805437165. The cubic root of 28287299 is about 304.6939472263.

The spelling of 28287299 in words is "twenty-eight million, two hundred eighty-seven thousand, two hundred ninety-nine".