28038378691 has 2 divisors, whose sum is σ = 28038378692. Its totient is φ = 28038378690.

The previous prime is 28038378671. The next prime is 28038378701. The reversal of 28038378691 is 19687383082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28038378691 - 2¹¹ = 28038376643 is a prime.

It is not a weakly prime, because it can be changed into another prime (28038378601) 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, 14019189345 + 14019189346.

It is an arithmetic number, because the mean of its divisors is an integer number (14019189346).

Almost surely, 2^28038378691 is an apocalyptic number.

28038378691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28038378691 is an equidigital number, since it uses as much as digits as its factorization.

28038378691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The spelling of 28038378691 in words is "twenty-eight billion, thirty-eight million, three hundred seventy-eight thousand, six hundred ninety-one".