28266281 has 8 divisors (see below), whose sum is σ = 29913600. Its totient is φ = 26634960.

The previous prime is 28266247. The next prime is 28266283. The reversal of 28266281 is 18266282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28266281 - 2¹⁰ = 28265257 is a prime.

It is a super-2 number, since 2×28266281² = 1597965283141922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28266283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266 + ... + 7523.

It is an arithmetic number, because the mean of its divisors is an integer number (3739200).

Almost surely, 2^28266281 is an apocalyptic number.

It is an amenable number.

28266281 is a deficient number, since it is larger than the sum of its proper divisors (1647319).

28266281 is a wasteful number, since it uses less digits than its factorization.

28266281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7999.

The product of its digits is 18432, while the sum is 35.

The square root of 28266281 is about 5316.6042734061. The cubic root of 28266281 is about 304.6184640663.

Subtracting from 28266281 its reverse (18266282), we obtain a palindrome (9999999).

The spelling of 28266281 in words is "twenty-eight million, two hundred sixty-six thousand, two hundred eighty-one".