2778371805 has 32 divisors (see below), whose sum is σ = 5104765440. Its totient is φ = 1276188480.

The previous prime is 2778371803. The next prime is 2778371831. The reversal of 2778371805 is 5081738772.

It is not a de Polignac number, because 2778371805 - 2¹ = 2778371803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778371801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 439987 + ... + 446256.

It is an arithmetic number, because the mean of its divisors is an integer number (159523920).

Almost surely, 2^2778371805 is an apocalyptic number.

It is an amenable number.

2778371805 is a deficient number, since it is larger than the sum of its proper divisors (2326393635).

2778371805 is a wasteful number, since it uses less digits than its factorization.

2778371805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886281.

The product of its (nonzero) digits is 658560, while the sum is 48.

The square root of 2778371805 is about 52710.2628052640. The cubic root of 2778371805 is about 1405.8213060869.

The spelling of 2778371805 in words is "two billion, seven hundred seventy-eight million, three hundred seventy-one thousand, eight hundred five".