28056249 has 24 divisors (see below), whose sum is σ = 44829512. Its totient is φ = 16796160.

The previous prime is 28056221. The next prime is 28056257. The reversal of 28056249 is 94265082.

It is a happy number.

28056249 is a `hidden beast` number, since 28 + 0 + 5 + 624 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 11799225 + 16257024 = 3435^2 + 4032^2 .

It is not a de Polignac number, because 28056249 - 2¹³ = 28048057 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28056269) 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 23 ways as a sum of consecutive naturals, for example, 1089 + ... + 7569.

Almost surely, 2^28056249 is an apocalyptic number.

It is an amenable number.

28056249 is a deficient number, since it is larger than the sum of its proper divisors (16773263).

28056249 is a wasteful number, since it uses less digits than its factorization.

28056249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6537 (or 6534 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 28056249 is about 5296.8149863857. The cubic root of 28056249 is about 303.8621005735.

The spelling of 28056249 in words is "twenty-eight million, fifty-six thousand, two hundred forty-nine".