28281959 has 4 divisors (see below), whose sum is σ = 28292616. Its totient is φ = 28271304.

The previous prime is 28281907. The next prime is 28281971. The reversal of 28281959 is 95918282.

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 28281959 - 2²⁰ = 27233383 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 (28281259) 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, 2177 + ... + 7829.

It is an arithmetic number, because the mean of its divisors is an integer number (7073154).

Almost surely, 2^28281959 is an apocalyptic number.

28281959 is a deficient number, since it is larger than the sum of its proper divisors (10657).

28281959 is an equidigital number, since it uses as much as digits as its factorization.

28281959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10656.

The product of its digits is 103680, while the sum is 44.

The square root of 28281959 is about 5318.0785063780. The cubic root of 28281959 is about 304.6747729192.

The spelling of 28281959 in words is "twenty-eight million, two hundred eighty-one thousand, nine hundred fifty-nine".