2778555787680 has 96 divisors (see below), whose sum is σ = 8895933623808. Its totient is φ = 728801510400.

The previous prime is 2778555787633. The next prime is 2778555787697. The reversal of 2778555787680 is 867875558772.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47418736 + ... + 47477295.

It is an arithmetic number, because the mean of its divisors is an integer number (92665975248).

Almost surely, 2^{2778555787680} is an apocalyptic number.

2778555787680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2778555787680 is an abundant number, since it is smaller than the sum of its proper divisors (6117377836128).

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

2778555787680 is a wasteful number, since it uses less digits than its factorization.

2778555787680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94896110 (or 94896102 counting only the distinct ones).

The product of its (nonzero) digits is 1843968000, while the sum is 75.

The spelling of 2778555787680 in words is "two trillion, seven hundred seventy-eight billion, five hundred fifty-five million, seven hundred eighty-seven thousand, six hundred eighty".