2780843728091 has 48 divisors (see below), whose sum is σ = 3329645679360. Its totient is φ = 2306795198400.

The previous prime is 2780843728051. The next prime is 2780843728133. The reversal of 2780843728091 is 1908273480872.

It is a de Polignac number, because none of the positive numbers 2^k-2780843728091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2780843728091.

It is not an unprimeable number, because it can be changed into a prime (2780843728051) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 92497820 + ... + 92527878.

It is an arithmetic number, because the mean of its divisors is an integer number (69367618320).

Almost surely, 2^{2780843728091} is an apocalyptic number.

2780843728091 is a deficient number, since it is larger than the sum of its proper divisors (548801951269).

2780843728091 is a wasteful number, since it uses less digits than its factorization.

2780843728091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30768 (or 30757 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 59.

The spelling of 2780843728091 in words is "two trillion, seven hundred eighty billion, eight hundred forty-three million, seven hundred twenty-eight thousand, ninety-one".