28144307 has 4 divisors (see below), whose sum is σ = 28157016. Its totient is φ = 28131600.

The previous prime is 28144289. The next prime is 28144331. The reversal of 28144307 is 70344182.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28144307 - 2⁶ = 28144243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28144307.

It is not an unprimeable number, because it can be changed into a prime (28144507) 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, 2069 + ... + 7782.

It is an arithmetic number, because the mean of its divisors is an integer number (7039254).

Almost surely, 2^28144307 is an apocalyptic number.

28144307 is a deficient number, since it is larger than the sum of its proper divisors (12709).

28144307 is an equidigital number, since it uses as much as digits as its factorization.

28144307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12708.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 28144307 is about 5305.1208280302. The cubic root of 28144307 is about 304.1796714608.

Adding to 28144307 its reverse (70344182), we get a palindrome (98488489).

The spelling of 28144307 in words is "twenty-eight million, one hundred forty-four thousand, three hundred seven".