28249073 has 2 divisors, whose sum is σ = 28249074. Its totient is φ = 28249072.

The previous prime is 28249061. The next prime is 28249097. The reversal of 28249073 is 37094282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17073424 + 11175649 = 4132^2 + 3343^2 .

It is a cyclic number.

It is not a de Polignac number, because 28249073 - 2⁸ = 28248817 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28240073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14124536 + 14124537.

It is an arithmetic number, because the mean of its divisors is an integer number (14124537).

Almost surely, 2^28249073 is an apocalyptic number.

It is an amenable number.

28249073 is a deficient number, since it is larger than the sum of its proper divisors (1).

28249073 is an equidigital number, since it uses as much as digits as its factorization.

28249073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 28249073 is about 5314.9857008274. The cubic root of 28249073 is about 304.5566361165.

The spelling of 28249073 in words is "twenty-eight million, two hundred forty-nine thousand, seventy-three".