28344649 has 2 divisors, whose sum is σ = 28344650. Its totient is φ = 28344648.

The previous prime is 28344587. The next prime is 28344689. The reversal of 28344649 is 94644382.

It is an a-pointer prime, because the next prime (28344689) can be obtained adding 28344649 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24324624 + 4020025 = 4932^2 + 2005^2 .

It is a cyclic number.

It is not a de Polignac number, because 28344649 - 2⁷ = 28344521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28344689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14172324 + 14172325.

It is an arithmetic number, because the mean of its divisors is an integer number (14172325).

Almost surely, 2^28344649 is an apocalyptic number.

It is an amenable number.

28344649 is a deficient number, since it is larger than the sum of its proper divisors (1).

28344649 is an equidigital number, since it uses as much as digits as its factorization.

28344649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 40.

The square root of 28344649 is about 5323.9692899189. The cubic root of 28344649 is about 304.8997215802.

The spelling of 28344649 in words is "twenty-eight million, three hundred forty-four thousand, six hundred forty-nine".