1340666778 has 16 divisors (see below), whose sum is σ = 2925091296. Its totient is φ = 406262640.

The previous prime is 1340666759. The next prime is 1340666791. The reversal of 1340666778 is 8776660431.

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 7 ways as a sum of consecutive naturals, for example, 10156501 + ... + 10156632.

It is an arithmetic number, because the mean of its divisors is an integer number (182818206).

Almost surely, 2^1340666778 is an apocalyptic number.

1340666778 is an abundant number, since it is smaller than the sum of its proper divisors (1584424518).

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

1340666778 is a wasteful number, since it uses less digits than its factorization.

1340666778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20313149.

The product of its (nonzero) digits is 1016064, while the sum is 48.

The square root of 1340666778 is about 36615.1167962086. The cubic root of 1340666778 is about 1102.6566031318.

The spelling of 1340666778 in words is "one billion, three hundred forty million, six hundred sixty-six thousand, seven hundred seventy-eight".