28145911 has 2 divisors, whose sum is σ = 28145912. Its totient is φ = 28145910.

The previous prime is 28145893. The next prime is 28145939. The reversal of 28145911 is 11954182.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28145911 - 2⁵ = 28145879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28145941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14072955 + 14072956.

It is an arithmetic number, because the mean of its divisors is an integer number (14072956).

Almost surely, 2^28145911 is an apocalyptic number.

28145911 is a deficient number, since it is larger than the sum of its proper divisors (1).

28145911 is an equidigital number, since it uses as much as digits as its factorization.

28145911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 31.

The square root of 28145911 is about 5305.2720005670. The cubic root of 28145911 is about 304.1854499524.

The spelling of 28145911 in words is "twenty-eight million, one hundred forty-five thousand, nine hundred eleven".