2782117778 has 8 divisors (see below), whose sum is σ = 4552556400. Its totient is φ = 1264598980.

The previous prime is 2782117721. The next prime is 2782117783. The reversal of 2782117778 is 8777112872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 63229928 + ... + 63229971.

It is an arithmetic number, because the mean of its divisors is an integer number (569069550).

Almost surely, 2^2782117778 is an apocalyptic number.

2782117778 is a deficient number, since it is larger than the sum of its proper divisors (1770438622).

2782117778 is a wasteful number, since it uses less digits than its factorization.

2782117778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126459912.

The product of its digits is 614656, while the sum is 50.

The square root of 2782117778 is about 52745.7844571488. The cubic root of 2782117778 is about 1406.4528274803.

The spelling of 2782117778 in words is "two billion, seven hundred eighty-two million, one hundred seventeen thousand, seven hundred seventy-eight".