28503869 has 2 divisors, whose sum is σ = 28503870. Its totient is φ = 28503868.

The previous prime is 28503851. The next prime is 28503889. The reversal of 28503869 is 96830582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15507844 + 12996025 = 3938^2 + 3605^2 .

It is a cyclic number.

It is not a de Polignac number, because 28503869 - 2²⁰ = 27455293 is a prime.

It is a super-2 number, since 2×28503869² = 1624941095938322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28503829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14251934 + 14251935.

It is an arithmetic number, because the mean of its divisors is an integer number (14251935).

Almost surely, 2^28503869 is an apocalyptic number.

It is an amenable number.

28503869 is a deficient number, since it is larger than the sum of its proper divisors (1).

28503869 is an equidigital number, since it uses as much as digits as its factorization.

28503869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 28503869 is about 5338.9014787688. The cubic root of 28503869 is about 305.4695589077.

The spelling of 28503869 in words is "twenty-eight million, five hundred three thousand, eight hundred sixty-nine".