28561249 has 2 divisors, whose sum is σ = 28561250. Its totient is φ = 28561248.

The previous prime is 28561243. The next prime is 28561271. The reversal of 28561249 is 94216582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17372224 + 11189025 = 4168^2 + 3345^2 .

It is a cyclic number.

It is not a de Polignac number, because 28561249 - 2²³ = 20172641 is a prime.

It is not a weakly prime, because it can be changed into another prime (28561243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14280624 + 14280625.

It is an arithmetic number, because the mean of its divisors is an integer number (14280625).

Almost surely, 2^28561249 is an apocalyptic number.

It is an amenable number.

28561249 is a deficient number, since it is larger than the sum of its proper divisors (1).

28561249 is an equidigital number, since it uses as much as digits as its factorization.

28561249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 37.

The square root of 28561249 is about 5344.2725417029. The cubic root of 28561249 is about 305.6743977069.

The spelling of 28561249 in words is "twenty-eight million, five hundred sixty-one thousand, two hundred forty-nine".