28208429 has 2 divisors, whose sum is σ = 28208430. Its totient is φ = 28208428.

The previous prime is 28208381. The next prime is 28208443. The reversal of 28208429 is 92480282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23377225 + 4831204 = 4835^2 + 2198^2 .

It is a cyclic number.

It is not a de Polignac number, because 28208429 - 2¹² = 28204333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28208459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14104214 + 14104215.

It is an arithmetic number, because the mean of its divisors is an integer number (14104215).

Almost surely, 2^28208429 is an apocalyptic number.

It is an amenable number.

28208429 is a deficient number, since it is larger than the sum of its proper divisors (1).

28208429 is an equidigital number, since it uses as much as digits as its factorization.

28208429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 28208429 is about 5311.1607959089. The cubic root of 28208429 is about 304.4105034010.

The spelling of 28208429 in words is "twenty-eight million, two hundred eight thousand, four hundred twenty-nine".