28547989 has 2 divisors, whose sum is σ = 28547990. Its totient is φ = 28547988.

The previous prime is 28547969. The next prime is 28547999. The reversal of 28547989 is 98974582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28536964 + 11025 = 5342^2 + 105^2 .

It is a cyclic number.

It is not a de Polignac number, because 28547989 - 2⁵ = 28547957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28547969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14273994 + 14273995.

It is an arithmetic number, because the mean of its divisors is an integer number (14273995).

Almost surely, 2^28547989 is an apocalyptic number.

It is an amenable number.

28547989 is a deficient number, since it is larger than the sum of its proper divisors (1).

28547989 is an equidigital number, since it uses as much as digits as its factorization.

28547989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 52.

The square root of 28547989 is about 5343.0318172364. The cubic root of 28547989 is about 305.6270857011.

The spelling of 28547989 in words is "twenty-eight million, five hundred forty-seven thousand, nine hundred eighty-nine".