28649 has 2 divisors, whose sum is σ = 28650. Its totient is φ = 28648.

The previous prime is 28643. The next prime is 28657. The reversal of 28649 is 94682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24025 + 4624 = 155^2 + 68^2 .

It is a cyclic number.

It is not a de Polignac number, because 28649 - 2⁸ = 28393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28643) 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, 14324 + 14325.

It is an arithmetic number, because the mean of its divisors is an integer number (14325).

2²⁸⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

28649 is a deficient number, since it is larger than the sum of its proper divisors (1).

28649 is an equidigital number, since it uses as much as digits as its factorization.

28649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 29.

The square root of 28649 is about 169.2601547914. The cubic root of 28649 is about 30.5987126917.

The spelling of 28649 in words is "twenty-eight thousand, six hundred forty-nine".