28020009443 has 2 divisors, whose sum is σ = 28020009444. Its totient is φ = 28020009442.

The previous prime is 28020009431. The next prime is 28020009473. The reversal of 28020009443 is 34490002082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28020009443 - 2¹² = 28020005347 is a prime.

It is not a weakly prime, because it can be changed into another prime (28020009473) 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, 14010004721 + 14010004722.

It is an arithmetic number, because the mean of its divisors is an integer number (14010004722).

Almost surely, 2^28020009443 is an apocalyptic number.

28020009443 is a deficient number, since it is larger than the sum of its proper divisors (1).

28020009443 is an equidigital number, since it uses as much as digits as its factorization.

28020009443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 32.

The spelling of 28020009443 in words is "twenty-eight billion, twenty million, nine thousand, four hundred forty-three".