28257347 has 2 divisors, whose sum is σ = 28257348. Its totient is φ = 28257346.

The previous prime is 28257343. The next prime is 28257367. The reversal of 28257347 is 74375282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28257347 - 2² = 28257343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28257347.

It is not a weakly prime, because it can be changed into another prime (28257343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14128673 + 14128674.

It is an arithmetic number, because the mean of its divisors is an integer number (14128674).

Almost surely, 2^28257347 is an apocalyptic number.

28257347 is a deficient number, since it is larger than the sum of its proper divisors (1).

28257347 is an equidigital number, since it uses as much as digits as its factorization.

28257347 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 28257347 is about 5315.7640090583. The cubic root of 28257347 is about 304.5863675419.

The spelling of 28257347 in words is "twenty-eight million, two hundred fifty-seven thousand, three hundred forty-seven".