2787813 has 48 divisors (see below), whose sum is σ = 5166720. Its totient is φ = 1410048.

The previous prime is 2787781. The next prime is 2787859. The reversal of 2787813 is 3187872.

2787813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2787813 - 2⁵ = 2787781 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2787013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20281 + ... + 20417.

It is an arithmetic number, because the mean of its divisors is an integer number (107640).

2^2787813 is an apocalyptic number.

It is an amenable number.

2787813 is a deficient number, since it is larger than the sum of its proper divisors (2378907).

2787813 is a wasteful number, since it uses less digits than its factorization.

2787813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186 (or 183 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 2787813 is about 1669.6745191803. The cubic root of 2787813 is about 140.7411881240.

It can be divided in two parts, 278781 and 3, that added together give a square (278784 = 528²).

The spelling of 2787813 in words is "two million, seven hundred eighty-seven thousand, eight hundred thirteen".