2778338919780 has 72 divisors (see below), whose sum is σ = 8428254307200. Its totient is φ = 740835323712.

The previous prime is 2778338919749. The next prime is 2778338919799. The reversal of 2778338919780 is 879198338772.

2778338919780 is a `hidden beast` number, since 2 + 7 + 7 + 83 + 389 + 1 + 97 + 80 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 2778338919699 and 2778338919708.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1884741 + ... + 3018099.

It is an arithmetic number, because the mean of its divisors is an integer number (117059087600).

Almost surely, 2^{2778338919780} is an apocalyptic number.

2778338919780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2778338919780 is an abundant number, since it is smaller than the sum of its proper divisors (5649915387420).

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

2778338919780 is a wasteful number, since it uses less digits than its factorization.

2778338919780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146993 (or 1146988 counting only the distinct ones).

The product of its (nonzero) digits is 256048128, while the sum is 72.

The spelling of 2778338919780 in words is "two trillion, seven hundred seventy-eight billion, three hundred thirty-eight million, nine hundred nineteen thousand, seven hundred eighty".