28295281 has 16 divisors (see below), whose sum is σ = 33804288. Its totient is φ = 23173200.

The previous prime is 28295261. The next prime is 28295291. The reversal of 28295281 is 18259282.

It is a cyclic number.

It is not a de Polignac number, because 28295281 - 2⁷ = 28295153 is a prime.

It is a super-2 number, since 2×28295281² = 1601245853737922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28295281.

It is not an unprimeable number, because it can be changed into a prime (28295231) 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 15 ways as a sum of consecutive naturals, for example, 17226 + ... + 18796.

It is an arithmetic number, because the mean of its divisors is an integer number (2112768).

Almost surely, 2^28295281 is an apocalyptic number.

It is an amenable number.

28295281 is a deficient number, since it is larger than the sum of its proper divisors (5509007).

28295281 is a wasteful number, since it uses less digits than its factorization.

28295281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692.

The product of its digits is 23040, while the sum is 37.

The square root of 28295281 is about 5319.3308789734. The cubic root of 28295281 is about 304.7226036487.

The spelling of 28295281 in words is "twenty-eight million, two hundred ninety-five thousand, two hundred eighty-one".