28723249 has 2 divisors, whose sum is σ = 28723250. Its totient is φ = 28723248.

The previous prime is 28723207. The next prime is 28723309. The reversal of 28723249 is 94232782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24850225 + 3873024 = 4985^2 + 1968^2 .

It is a cyclic number.

It is not a de Polignac number, because 28723249 - 2¹⁵ = 28690481 is a prime.

It is not a weakly prime, because it can be changed into another prime (28726249) 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, 14361624 + 14361625.

It is an arithmetic number, because the mean of its divisors is an integer number (14361625).

Almost surely, 2^28723249 is an apocalyptic number.

It is an amenable number.

28723249 is a deficient number, since it is larger than the sum of its proper divisors (1).

28723249 is an equidigital number, since it uses as much as digits as its factorization.

28723249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 37.

The square root of 28723249 is about 5359.4075232249. The cubic root of 28723249 is about 306.2512389787.

The spelling of 28723249 in words is "twenty-eight million, seven hundred twenty-three thousand, two hundred forty-nine".