28090281 has 8 divisors (see below), whose sum is σ = 37797760. Its totient is φ = 18554832.

The previous prime is 28090277. The next prime is 28090301. The reversal of 28090281 is 18209082.

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

It is not a de Polignac number, because 28090281 - 2² = 28090277 is a prime.

It is a super-2 number, since 2×28090281² = 1578127773317922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28090201) 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, 42625 + ... + 43278.

It is an arithmetic number, because the mean of its divisors is an integer number (4724720).

Almost surely, 2^28090281 is an apocalyptic number.

It is an amenable number.

28090281 is a deficient number, since it is larger than the sum of its proper divisors (9707479).

28090281 is a wasteful number, since it uses less digits than its factorization.

28090281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86015.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 28090281 is about 5300.0265093677. The cubic root of 28090281 is about 303.9849116761.

The spelling of 28090281 in words is "twenty-eight million, ninety thousand, two hundred eighty-one".