28056281 has 8 divisors (see below), whose sum is σ = 30780000. Its totient is φ = 25361440.

The previous prime is 28056277. The next prime is 28056313. The reversal of 28056281 is 18265082.

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

It is a cyclic number.

It is not a de Polignac number, because 28056281 - 2² = 28056277 is a prime.

It is a super-2 number, since 2×28056281² = 1574309807101922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28056221) 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 7 ways as a sum of consecutive naturals, for example, 5156 + ... + 9093.

It is an arithmetic number, because the mean of its divisors is an integer number (3847500).

Almost surely, 2^28056281 is an apocalyptic number.

It is an amenable number.

28056281 is a deficient number, since it is larger than the sum of its proper divisors (2723719).

28056281 is a wasteful number, since it uses less digits than its factorization.

28056281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14439.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 28056281 is about 5296.8180070680. The cubic root of 28056281 is about 303.8622160984.

The spelling of 28056281 in words is "twenty-eight million, fifty-six thousand, two hundred eighty-one".