28870111 has 2 divisors, whose sum is σ = 28870112. Its totient is φ = 28870110.

The previous prime is 28870103. The next prime is 28870117. The reversal of 28870111 is 11107882.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28870111 - 2³ = 28870103 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28870111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28870117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14435055 + 14435056.

It is an arithmetic number, because the mean of its divisors is an integer number (14435056).

Almost surely, 2^28870111 is an apocalyptic number.

28870111 is a deficient number, since it is larger than the sum of its proper divisors (1).

28870111 is an equidigital number, since it uses as much as digits as its factorization.

28870111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 28870111 is about 5373.0913820630. The cubic root of 28870111 is about 306.7723062068.

Adding to 28870111 its reverse (11107882), we get a palindrome (39977993).

The spelling of 28870111 in words is "twenty-eight million, eight hundred seventy thousand, one hundred eleven".