28431018223 has 4 divisors (see below), whose sum is σ = 28436080048. Its totient is φ = 28425956400.

The previous prime is 28431018211. The next prime is 28431018233. The reversal of 28431018223 is 32281013482.

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 28431018223 - 2⁵ = 28431018191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28431018233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2522478 + ... + 2533723.

It is an arithmetic number, because the mean of its divisors is an integer number (7109020012).

Almost surely, 2^28431018223 is an apocalyptic number.

28431018223 is a deficient number, since it is larger than the sum of its proper divisors (5061825).

28431018223 is an equidigital number, since it uses as much as digits as its factorization.

28431018223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5061824.

The product of its (nonzero) digits is 18432, while the sum is 34.

The spelling of 28431018223 in words is "twenty-eight billion, four hundred thirty-one million, eighteen thousand, two hundred twenty-three".