28989409 has 2 divisors, whose sum is σ = 28989410. Its totient is φ = 28989408.

The previous prime is 28989397. The next prime is 28989413. The reversal of 28989409 is 90498982.

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., 21715600 + 7273809 = 4660^2 + 2697^2 .

It is a cyclic number.

It is not a de Polignac number, because 28989409 - 2⁵ = 28989377 is a prime.

It is not a weakly prime, because it can be changed into another prime (28989469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14494704 + 14494705.

It is an arithmetic number, because the mean of its divisors is an integer number (14494705).

Almost surely, 2^28989409 is an apocalyptic number.

It is an amenable number.

28989409 is a deficient number, since it is larger than the sum of its proper divisors (1).

28989409 is an equidigital number, since it uses as much as digits as its factorization.

28989409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 28989409 is about 5384.1813676733. The cubic root of 28989409 is about 307.1942769715.

It can be divided in two parts, 289 and 89409, that added together give a palindrome (89698).

The spelling of 28989409 in words is "twenty-eight million, nine hundred eighty-nine thousand, four hundred nine".