2787856 has 10 divisors (see below), whose sum is σ = 5401502. Its totient is φ = 1393920.

The previous prime is 2787781. The next prime is 2787859. The reversal of 2787856 is 6587872.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2611456 + 176400 = 1616^2 + 420^2 .

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (2787859) 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 as a sum of consecutive naturals, namely, 87105 + ... + 87136.

2^2787856 is an apocalyptic number.

It is an amenable number.

2787856 is a deficient number, since it is larger than the sum of its proper divisors (2613646).

2787856 is a wasteful number, since it uses less digits than its factorization.

2787856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174249 (or 174243 counting only the distinct ones).

The product of its digits is 188160, while the sum is 43.

The square root of 2787856 is about 1669.6873958918. The cubic root of 2787856 is about 140.7419117306.

The spelling of 2787856 in words is "two million, seven hundred eighty-seven thousand, eight hundred fifty-six".