28426289 has 2 divisors, whose sum is σ = 28426290. Its totient is φ = 28426288.

The previous prime is 28426253. The next prime is 28426297. The reversal of 28426289 is 98262482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16120225 + 12306064 = 4015^2 + 3508^2 .

It is a cyclic number.

It is not a de Polignac number, because 28426289 - 2²⁴ = 11649073 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28426589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14213144 + 14213145.

It is an arithmetic number, because the mean of its divisors is an integer number (14213145).

Almost surely, 2^28426289 is an apocalyptic number.

It is an amenable number.

28426289 is a deficient number, since it is larger than the sum of its proper divisors (1).

28426289 is an equidigital number, since it uses as much as digits as its factorization.

28426289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 41.

The square root of 28426289 is about 5331.6309887313. The cubic root of 28426289 is about 305.1921712878.

The spelling of 28426289 in words is "twenty-eight million, four hundred twenty-six thousand, two hundred eighty-nine".