2787878 has 4 divisors (see below), whose sum is σ = 4181820. Its totient is φ = 1393938.

The previous prime is 2787859. The next prime is 2787907. The reversal of 2787878 is 8787872.

It is a semiprime because it is the product of two primes.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696968 + ... + 696971.

It is an arithmetic number, because the mean of its divisors is an integer number (1045455).

2^2787878 is an apocalyptic number.

2787878 is a deficient number, since it is larger than the sum of its proper divisors (1393942).

2787878 is a wasteful number, since it uses less digits than its factorization.

2787878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393941.

The product of its digits is 351232, while the sum is 47.

The square root of 2787878 is about 1669.6939839384. The cubic root of 2787878 is about 140.7422819451.

The spelling of 2787878 in words is "two million, seven hundred eighty-seven thousand, eight hundred seventy-eight".