28347409 has 2 divisors, whose sum is σ = 28347410. Its totient is φ = 28347408.

The previous prime is 28347353. The next prime is 28347419. The reversal of 28347409 is 90474382.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20729809 + 7617600 = 4553^2 + 2760^2 .

It is a cyclic number.

It is not a de Polignac number, because 28347409 - 2⁷ = 28347281 is a prime.

It is not a weakly prime, because it can be changed into another prime (28347419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14173704 + 14173705.

It is an arithmetic number, because the mean of its divisors is an integer number (14173705).

Almost surely, 2^28347409 is an apocalyptic number.

It is an amenable number.

28347409 is a deficient number, since it is larger than the sum of its proper divisors (1).

28347409 is an equidigital number, since it uses as much as digits as its factorization.

28347409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 28347409 is about 5324.2284887108. The cubic root of 28347409 is about 304.9096175799.

The spelling of 28347409 in words is "twenty-eight million, three hundred forty-seven thousand, four hundred nine".