2778812 has 12 divisors (see below), whose sum is σ = 4881576. Its totient is φ = 1384080.

The previous prime is 2778799. The next prime is 2778823. The reversal of 2778812 is 2188772.

It is a super-2 number, since 2×2778812² = 15443592262688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14 + ... + 2357.

It is an arithmetic number, because the mean of its divisors is an integer number (406798).

2^2778812 is an apocalyptic number.

It is an amenable number.

2778812 is a deficient number, since it is larger than the sum of its proper divisors (2102764).

2778812 is a wasteful number, since it uses less digits than its factorization.

2778812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2668 (or 2666 counting only the distinct ones).

The product of its digits is 12544, while the sum is 35.

The square root of 2778812 is about 1666.9769044591. The cubic root of 2778812 is about 140.5895546550.

The spelling of 2778812 in words is "two million, seven hundred seventy-eight thousand, eight hundred twelve".