2778667380 has 54 divisors (see below), whose sum is σ = 8430770166. Its totient is φ = 740789376.

The previous prime is 2778667327. The next prime is 2778667471. The reversal of 2778667380 is 837668772.

It can be written as a sum of positive squares in 3 ways, for example, as 16744464 + 2761922916 = 4092^2 + 52554^2 .

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 705256 + ... + 709184.

Almost surely, 2^2778667380 is an apocalyptic number.

2778667380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2778667380 is an abundant number, since it is smaller than the sum of its proper divisors (5652102786).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2778667380 is an equidigital number, since it uses as much as digits as its factorization.

2778667380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7873 (or 3939 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 54.

The square root of 2778667380 is about 52713.0665015800. The cubic root of 2778667380 is about 1405.8711567341.

The spelling of 2778667380 in words is "two billion, seven hundred seventy-eight million, six hundred sixty-seven thousand, three hundred eighty".