28351489 has 2 divisors, whose sum is σ = 28351490. Its totient is φ = 28351488.

The previous prime is 28351457. The next prime is 28351493. The reversal of 28351489 is 98415382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17514225 + 10837264 = 4185^2 + 3292^2 .

It is a cyclic number.

It is not a de Polignac number, because 28351489 - 2⁵ = 28351457 is a prime.

It is not a weakly prime, because it can be changed into another prime (28351889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14175744 + 14175745.

It is an arithmetic number, because the mean of its divisors is an integer number (14175745).

Almost surely, 2^28351489 is an apocalyptic number.

It is an amenable number.

28351489 is a deficient number, since it is larger than the sum of its proper divisors (1).

28351489 is an equidigital number, since it uses as much as digits as its factorization.

28351489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 40.

The square root of 28351489 is about 5324.6116290299. The cubic root of 28351489 is about 304.9242452726.

The spelling of 28351489 in words is "twenty-eight million, three hundred fifty-one thousand, four hundred eighty-nine".