28489649 has 2 divisors, whose sum is σ = 28489650. Its totient is φ = 28489648.

The previous prime is 28489639. The next prime is 28489723. The reversal of 28489649 is 94698482.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23107249 + 5382400 = 4807^2 + 2320^2 .

It is a cyclic number.

It is not a de Polignac number, because 28489649 - 2⁴ = 28489633 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28489597 and 28489606.

It is not a weakly prime, because it can be changed into another prime (28489639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14244824 + 14244825.

It is an arithmetic number, because the mean of its divisors is an integer number (14244825).

Almost surely, 2^28489649 is an apocalyptic number.

It is an amenable number.

28489649 is a deficient number, since it is larger than the sum of its proper divisors (1).

28489649 is an equidigital number, since it uses as much as digits as its factorization.

28489649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 50.

The square root of 28489649 is about 5337.5695780008. The cubic root of 28489649 is about 305.4187529432.

The spelling of 28489649 in words is "twenty-eight million, four hundred eighty-nine thousand, six hundred forty-nine".