2778356823 has 16 divisors (see below), whose sum is σ = 4042179072. Its totient is φ = 1683464000.

The previous prime is 2778356821. The next prime is 2778356827. The reversal of 2778356823 is 3286538772.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2778356823 - 2¹ = 2778356821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778356821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 208738 + ... + 221648.

It is an arithmetic number, because the mean of its divisors is an integer number (252636192).

Almost surely, 2^2778356823 is an apocalyptic number.

2778356823 is a deficient number, since it is larger than the sum of its proper divisors (1263822249).

2778356823 is a wasteful number, since it uses less digits than its factorization.

2778356823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19446.

The product of its digits is 3386880, while the sum is 51.

The square root of 2778356823 is about 52710.1206885357. The cubic root of 2778356823 is about 1405.8187791809.

The spelling of 2778356823 in words is "two billion, seven hundred seventy-eight million, three hundred fifty-six thousand, eight hundred twenty-three".