28740287 has 2 divisors, whose sum is σ = 28740288. Its totient is φ = 28740286.

The previous prime is 28740281. The next prime is 28740289. The reversal of 28740287 is 78204782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28740287 - 2⁸ = 28740031 is a prime.

Together with 28740289, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28740287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28740281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14370143 + 14370144.

It is an arithmetic number, because the mean of its divisors is an integer number (14370144).

Almost surely, 2^28740287 is an apocalyptic number.

28740287 is a deficient number, since it is larger than the sum of its proper divisors (1).

28740287 is an equidigital number, since it uses as much as digits as its factorization.

28740287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50176, while the sum is 38.

The square root of 28740287 is about 5360.9968289489. The cubic root of 28740287 is about 306.3117808442.

The spelling of 28740287 in words is "twenty-eight million, seven hundred forty thousand, two hundred eighty-seven".