2782779813 has 32 divisors (see below), whose sum is σ = 4516836480. Its totient is φ = 1679253120.

The previous prime is 2782779803. The next prime is 2782779817. The reversal of 2782779813 is 3189772872.

2782779813 is a `hidden beast` number, since 278 + 277 + 98 + 13 = 666.

It is not a de Polignac number, because 2782779813 - 2⁶ = 2782779749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2782779813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2782779817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49095 + ... + 89307.

It is an arithmetic number, because the mean of its divisors is an integer number (141151140).

Almost surely, 2^2782779813 is an apocalyptic number.

It is an amenable number.

2782779813 is a deficient number, since it is larger than the sum of its proper divisors (1734056667).

2782779813 is a wasteful number, since it uses less digits than its factorization.

2782779813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40466 (or 40460 counting only the distinct ones).

The product of its digits is 2370816, while the sum is 54.

The square root of 2782779813 is about 52752.0597986467. The cubic root of 2782779813 is about 1406.5643788505.

The spelling of 2782779813 in words is "two billion, seven hundred eighty-two million, seven hundred seventy-nine thousand, eight hundred thirteen".