28343489 has 2 divisors, whose sum is σ = 28343490. Its totient is φ = 28343488.

The previous prime is 28343461. The next prime is 28343507. The reversal of 28343489 is 98434382.

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., 26884225 + 1459264 = 5185^2 + 1208^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28343489 is a prime.

It is not a weakly prime, because it can be changed into another prime (28343449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14171744 + 14171745.

It is an arithmetic number, because the mean of its divisors is an integer number (14171745).

Almost surely, 2^28343489 is an apocalyptic number.

It is an amenable number.

28343489 is a deficient number, since it is larger than the sum of its proper divisors (1).

28343489 is an equidigital number, since it uses as much as digits as its factorization.

28343489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 41.

The square root of 28343489 is about 5323.8603475298. The cubic root of 28343489 is about 304.8955622001.

The spelling of 28343489 in words is "twenty-eight million, three hundred forty-three thousand, four hundred eighty-nine".