28286249 has 8 divisors (see below), whose sum is σ = 30442248. Its totient is φ = 26184960.

The previous prime is 28286239. The next prime is 28286287. The reversal of 28286249 is 94268282.

It can be written as a sum of positive squares in 4 ways, for example, as 196249 + 28090000 = 443^2 + 5300^2 .

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 28286249 - 2⁴ = 28286233 is a prime.

It is a super-2 number, since 2×28286249² = 1600223764980002, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28286239) 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, 12602 + ... + 14675.

It is an arithmetic number, because the mean of its divisors is an integer number (3805281).

Almost surely, 2^28286249 is an apocalyptic number.

It is an amenable number.

28286249 is a deficient number, since it is larger than the sum of its proper divisors (2155999).

28286249 is a wasteful number, since it uses less digits than its factorization.

28286249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27355.

The product of its digits is 110592, while the sum is 41.

The square root of 28286249 is about 5318.4818322525. The cubic root of 28286249 is about 304.6901771880.

The spelling of 28286249 in words is "twenty-eight million, two hundred eighty-six thousand, two hundred forty-nine".