28147643 has 2 divisors, whose sum is σ = 28147644. Its totient is φ = 28147642.

The previous prime is 28147633. The next prime is 28147663. The reversal of 28147643 is 34674182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28147643 - 2¹² = 28143547 is a prime.

It is not a weakly prime, because it can be changed into another prime (28147633) 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, 14073821 + 14073822.

It is an arithmetic number, because the mean of its divisors is an integer number (14073822).

Almost surely, 2^28147643 is an apocalyptic number.

28147643 is a deficient number, since it is larger than the sum of its proper divisors (1).

28147643 is an equidigital number, since it uses as much as digits as its factorization.

28147643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 35.

The square root of 28147643 is about 5305.4352319108. The cubic root of 28147643 is about 304.1916893240.

The spelling of 28147643 in words is "twenty-eight million, one hundred forty-seven thousand, six hundred forty-three".