28069649 has 2 divisors, whose sum is σ = 28069650. Its totient is φ = 28069648.

The previous prime is 28069633. The next prime is 28069673. The reversal of 28069649 is 94696082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25573249 + 2496400 = 5057^2 + 1580^2 .

It is a cyclic number.

It is not a de Polignac number, because 28069649 - 2⁴ = 28069633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28069619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14034824 + 14034825.

It is an arithmetic number, because the mean of its divisors is an integer number (14034825).

Almost surely, 2^28069649 is an apocalyptic number.

It is an amenable number.

28069649 is a deficient number, since it is larger than the sum of its proper divisors (1).

28069649 is an equidigital number, since it uses as much as digits as its factorization.

28069649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 28069649 is about 5298.0797464742. The cubic root of 28069649 is about 303.9104689314.

The spelling of 28069649 in words is "twenty-eight million, sixty-nine thousand, six hundred forty-nine".