28753909 has 2 divisors, whose sum is σ = 28753910. Its totient is φ = 28753908.

The previous prime is 28753903. The next prime is 28753937. The reversal of 28753909 is 90935782.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14668900 + 14085009 = 3830^2 + 3753^2 .

It is a cyclic number.

It is not a de Polignac number, because 28753909 - 2¹⁷ = 28622837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28753903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14376954 + 14376955.

It is an arithmetic number, because the mean of its divisors is an integer number (14376955).

Almost surely, 2^28753909 is an apocalyptic number.

It is an amenable number.

28753909 is a deficient number, since it is larger than the sum of its proper divisors (1).

28753909 is an equidigital number, since it uses as much as digits as its factorization.

28753909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 28753909 is about 5362.2671511218. The cubic root of 28753909 is about 306.3601672786.

The spelling of 28753909 in words is "twenty-eight million, seven hundred fifty-three thousand, nine hundred nine".