28155503 has 2 divisors, whose sum is σ = 28155504. Its totient is φ = 28155502.

The previous prime is 28155481. The next prime is 28155529. The reversal of 28155503 is 30555182.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28155503 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28155563) 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, 14077751 + 14077752.

It is an arithmetic number, because the mean of its divisors is an integer number (14077752).

Almost surely, 2^28155503 is an apocalyptic number.

28155503 is a deficient number, since it is larger than the sum of its proper divisors (1).

28155503 is an equidigital number, since it uses as much as digits as its factorization.

28155503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 28155503 is about 5306.1759299895. The cubic root of 28155503 is about 304.2200010393.

The spelling of 28155503 in words is "twenty-eight million, one hundred fifty-five thousand, five hundred three".