2787 has 4 divisors (see below), whose sum is σ = 3720.
Its totient is φ = 1856.
The previous prime is 2777. The next prime is 2789. The reversal of 2787 is 7872.
2787 is nontrivially palindromic in base 15.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 2787 - 27 = 2659 is a prime.
It is an Ulam number.
It is a D-number.
It is an alternating number because its digits alternate between even and odd.
2787 is an undulating number in base 15.
2787 is a lucky number.
It is not an unprimeable number, because it can be changed into a prime (2789) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 462 + ... + 467.
It is an arithmetic number, because the mean of its divisors is an integer number (930).
2787 is a deficient number, since it is larger than the sum of its proper divisors (933).
2787 is an equidigital number, since it uses as much as digits as its factorization.
2787 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 932.
The product of its digits is 784, while the sum is 24.
The square root of 2787 is about 52.7920448553.
The cubic root of 2787 is about 14.0727505510.
The spelling of 2787 in words is "two thousand, seven hundred eighty-seven".