2786378378 has 32 divisors (see below), whose sum is σ = 4989966336. Its totient is φ = 1140950448.

The previous prime is 2786378317. The next prime is 2786378389. The reversal of 2786378378 is 8738736872.

It is a happy number.

2786378378 is a modest number, since divided by 378378 gives 2786 as remainder.

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, 312125 + ... + 320927.

It is an arithmetic number, because the mean of its divisors is an integer number (155936448).

Almost surely, 2^2786378378 is an apocalyptic number.

2786378378 is a deficient number, since it is larger than the sum of its proper divisors (2203587958).

2786378378 is a wasteful number, since it uses less digits than its factorization.

2786378378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9818.

The product of its digits is 18966528, while the sum is 59.

The square root of 2786378378 is about 52786.1570679283. The cubic root of 2786378378 is about 1407.1704195046.

The spelling of 2786378378 in words is "two billion, seven hundred eighty-six million, three hundred seventy-eight thousand, three hundred seventy-eight".