28354281 has 4 divisors (see below), whose sum is σ = 37805712. Its totient is φ = 18902852.

The previous prime is 28354273. The next prime is 28354297. The reversal of 28354281 is 18245382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28354281 - 2³ = 28354273 is a prime.

It is a super-2 number, since 2×28354281² = 1607930502053922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28354201) 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, 4725711 + ... + 4725716.

It is an arithmetic number, because the mean of its divisors is an integer number (9451428).

Almost surely, 2^28354281 is an apocalyptic number.

It is an amenable number.

28354281 is a deficient number, since it is larger than the sum of its proper divisors (9451431).

28354281 is an equidigital number, since it uses as much as digits as its factorization.

28354281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9451430.

The product of its digits is 15360, while the sum is 33.

The square root of 28354281 is about 5324.8738013215. The cubic root of 28354281 is about 304.9342543947.

The spelling of 28354281 in words is "twenty-eight million, three hundred fifty-four thousand, two hundred eighty-one".