2778783 has 16 divisors (see below), whose sum is σ = 4275456. Its totient is φ = 1572480.

The previous prime is 2778779. The next prime is 2778793. The reversal of 2778783 is 3878772.

It is not a de Polignac number, because 2778783 - 2² = 2778779 is a prime.

It is a super-2 number, since 2×2778783² = 15443269922178, which contains 22 as substring.

2778783 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1788 + ... + 2958.

It is an arithmetic number, because the mean of its divisors is an integer number (267216).

2^2778783 is an apocalyptic number.

2778783 is a deficient number, since it is larger than the sum of its proper divisors (1496673).

2778783 is a wasteful number, since it uses less digits than its factorization.

2778783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294.

The product of its digits is 131712, while the sum is 42.

The square root of 2778783 is about 1666.9682060555. The cubic root of 2778783 is about 140.5890655838.

The spelling of 2778783 in words is "two million, seven hundred seventy-eight thousand, seven hundred eighty-three".