6781778 has 16 divisors (see below), whose sum is σ = 10414656. Its totient is φ = 3311280.

The previous prime is 6781763. The next prime is 6781799. The reversal of 6781778 is 8771876.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23000 + ... + 23292.

It is an arithmetic number, because the mean of its divisors is an integer number (650916).

Almost surely, 2^6781778 is an apocalyptic number.

6781778 is a deficient number, since it is larger than the sum of its proper divisors (3632878).

6781778 is a wasteful number, since it uses less digits than its factorization.

6781778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529.

The product of its digits is 131712, while the sum is 44.

The square root of 6781778 is about 2604.1847092708. The cubic root of 6781778 is about 189.2842693680.

The spelling of 6781778 in words is "six million, seven hundred eighty-one thousand, seven hundred seventy-eight".