28840249 has 2 divisors, whose sum is σ = 28840250. Its totient is φ = 28840248.

The previous prime is 28840243. The next prime is 28840277. The reversal of 28840249 is 94204882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24324624 + 4515625 = 4932^2 + 2125^2 .

It is a cyclic number.

It is not a de Polignac number, because 28840249 - 2³ = 28840241 is a prime.

It is not a weakly prime, because it can be changed into another prime (28840241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14420124 + 14420125.

It is an arithmetic number, because the mean of its divisors is an integer number (14420125).

Almost surely, 2^28840249 is an apocalyptic number.

It is an amenable number.

28840249 is a deficient number, since it is larger than the sum of its proper divisors (1).

28840249 is an equidigital number, since it uses as much as digits as its factorization.

28840249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 28840249 is about 5370.3118159005. The cubic root of 28840249 is about 306.6664990285. Note that the first 3 decimals are identical.

The spelling of 28840249 in words is "twenty-eight million, eight hundred forty thousand, two hundred forty-nine".