28240489 has 2 divisors, whose sum is σ = 28240490. Its totient is φ = 28240488.

The previous prime is 28240469. The next prime is 28240493. The reversal of 28240489 is 98404282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28005264 + 235225 = 5292^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 28240489 - 2¹⁵ = 28207721 is a prime.

It is not a weakly prime, because it can be changed into another prime (28240469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14120244 + 14120245.

It is an arithmetic number, because the mean of its divisors is an integer number (14120245).

Almost surely, 2^28240489 is an apocalyptic number.

It is an amenable number.

28240489 is a deficient number, since it is larger than the sum of its proper divisors (1).

28240489 is an equidigital number, since it uses as much as digits as its factorization.

28240489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 28240489 is about 5314.1781114298. The cubic root of 28240489 is about 304.5257846143.

The spelling of 28240489 in words is "twenty-eight million, two hundred forty thousand, four hundred eighty-nine".