6783894978 has 32 divisors (see below), whose sum is σ = 15547652736. Its totient is φ = 1933054848.

The previous prime is 6783894967. The next prime is 6783894979. The reversal of 6783894978 is 8794983876.

It is not an unprimeable number, because it can be changed into a prime (6783894979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200851 + ... + 232182.

It is an arithmetic number, because the mean of its divisors is an integer number (485864148).

Almost surely, 2^6783894978 is an apocalyptic number.

6783894978 is an abundant number, since it is smaller than the sum of its proper divisors (8763757758).

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

6783894978 is a wasteful number, since it uses less digits than its factorization.

6783894978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433418.

The product of its digits is 146313216, while the sum is 69.

The square root of 6783894978 is about 82364.4035855296. The cubic root of 6783894978 is about 1893.0396277517.

The spelling of 6783894978 in words is "six billion, seven hundred eighty-three million, eight hundred ninety-four thousand, nine hundred seventy-eight".