28257743 has 2 divisors, whose sum is σ = 28257744. Its totient is φ = 28257742.

The previous prime is 28257721. The next prime is 28257773. The reversal of 28257743 is 34775282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28257743 - 2¹⁴ = 28241359 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28257697 and 28257706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28257773) 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, 14128871 + 14128872.

It is an arithmetic number, because the mean of its divisors is an integer number (14128872).

Almost surely, 2^28257743 is an apocalyptic number.

28257743 is a deficient number, since it is larger than the sum of its proper divisors (1).

28257743 is an equidigital number, since it uses as much as digits as its factorization.

28257743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94080, while the sum is 38.

The square root of 28257743 is about 5315.8012566310. The cubic root of 28257743 is about 304.5877903653.

The spelling of 28257743 in words is "twenty-eight million, two hundred fifty-seven thousand, seven hundred forty-three".