2778356780 has 24 divisors (see below), whose sum is σ = 5871718608. Its totient is φ = 1104262848.

The previous prime is 2778356761. The next prime is 2778356821. The reversal of 2778356780 is 876538772.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 439274 + ... + 445553.

It is an arithmetic number, because the mean of its divisors is an integer number (244654942).

Almost surely, 2^2778356780 is an apocalyptic number.

2778356780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2778356780 is an abundant number, since it is smaller than the sum of its proper divisors (3093361828).

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

2778356780 is a wasteful number, since it uses less digits than its factorization.

2778356780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884993 (or 884991 counting only the distinct ones).

The product of its (nonzero) digits is 3951360, while the sum is 53.

The square root of 2778356780 is about 52710.1202806444. The cubic root of 2778356780 is about 1405.8187719284.

The spelling of 2778356780 in words is "two billion, seven hundred seventy-eight million, three hundred fifty-six thousand, seven hundred eighty".