28287377 has 2 divisors, whose sum is σ = 28287378. Its totient is φ = 28287376.

The previous prime is 28287361. The next prime is 28287379. The reversal of 28287377 is 77378282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28206721 + 80656 = 5311^2 + 284^2 .

It is a cyclic number.

It is not a de Polignac number, because 28287377 - 2⁴ = 28287361 is a prime.

Together with 28287379, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28287379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14143688 + 14143689.

It is an arithmetic number, because the mean of its divisors is an integer number (14143689).

Almost surely, 2^28287377 is an apocalyptic number.

It is an amenable number.

28287377 is a deficient number, since it is larger than the sum of its proper divisors (1).

28287377 is an equidigital number, since it uses as much as digits as its factorization.

28287377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 263424, while the sum is 44.

The square root of 28287377 is about 5318.5878764950. The cubic root of 28287377 is about 304.6942272825.

The spelling of 28287377 in words is "twenty-eight million, two hundred eighty-seven thousand, three hundred seventy-seven".