28550609 has 2 divisors, whose sum is σ = 28550610. Its totient is φ = 28550608.

The previous prime is 28550603. The next prime is 28550611. The reversal of 28550609 is 90605582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16321600 + 12229009 = 4040^2 + 3497^2 .

It is a cyclic number.

It is not a de Polignac number, because 28550609 - 2²⁴ = 11773393 is a prime.

Together with 28550611, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28550603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14275304 + 14275305.

It is an arithmetic number, because the mean of its divisors is an integer number (14275305).

Almost surely, 2^28550609 is an apocalyptic number.

It is an amenable number.

28550609 is a deficient number, since it is larger than the sum of its proper divisors (1).

28550609 is an equidigital number, since it uses as much as digits as its factorization.

28550609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 28550609 is about 5343.2769907614. The cubic root of 28550609 is about 305.6364350867.

The spelling of 28550609 in words is "twenty-eight million, five hundred fifty thousand, six hundred nine".