2778819405 has 64 divisors (see below), whose sum is σ = 4929527808. Its totient is φ = 1329546240.

The previous prime is 2778819383. The next prime is 2778819419. The reversal of 2778819405 is 5049188772.

2778819405 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 2778819405 - 2¹¹ = 2778817357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2151810 + ... + 2153100.

It is an arithmetic number, because the mean of its divisors is an integer number (77023872).

Almost surely, 2^2778819405 is an apocalyptic number.

It is an amenable number.

2778819405 is a deficient number, since it is larger than the sum of its proper divisors (2150708403).

2778819405 is a wasteful number, since it uses less digits than its factorization.

2778819405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706.

The product of its (nonzero) digits is 1128960, while the sum is 51.

The square root of 2778819405 is about 52714.5084867534. The cubic root of 2778819405 is about 1405.8967953630.

The spelling of 2778819405 in words is "two billion, seven hundred seventy-eight million, eight hundred nineteen thousand, four hundred five".