28378111 has 2 divisors, whose sum is σ = 28378112. Its totient is φ = 28378110.

The previous prime is 28378099. The next prime is 28378121. The reversal of 28378111 is 11187382.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28378111 - 2⁵ = 28378079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28378121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14189055 + 14189056.

It is an arithmetic number, because the mean of its divisors is an integer number (14189056).

Almost surely, 2^28378111 is an apocalyptic number.

28378111 is a deficient number, since it is larger than the sum of its proper divisors (1).

28378111 is an equidigital number, since it uses as much as digits as its factorization.

28378111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 31.

The square root of 28378111 is about 5327.1109430910. The cubic root of 28378111 is about 305.0196565312.

The spelling of 28378111 in words is "twenty-eight million, three hundred seventy-eight thousand, one hundred eleven".