2778371806 has 32 divisors (see below), whose sum is σ = 4889299968. Its totient is φ = 1159258560.

The previous prime is 2778371803. The next prime is 2778371831. The reversal of 2778371806 is 6081738772.

It is a self number, because there is not a number n which added to its sum of digits gives 2778371806.

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 15 ways as a sum of consecutive naturals, for example, 283911 + ... + 293533.

It is an arithmetic number, because the mean of its divisors is an integer number (152790624).

Almost surely, 2^2778371806 is an apocalyptic number.

2778371806 is a deficient number, since it is larger than the sum of its proper divisors (2110928162).

2778371806 is a wasteful number, since it uses less digits than its factorization.

2778371806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10176.

The product of its (nonzero) digits is 790272, while the sum is 49.

The square root of 2778371806 is about 52710.2628147498. The cubic root of 2778371806 is about 1405.8213062555.

The spelling of 2778371806 in words is "two billion, seven hundred seventy-eight million, three hundred seventy-one thousand, eight hundred six".