6777778890 has 16 divisors (see below), whose sum is σ = 16266669408. Its totient is φ = 1807407696.

The previous prime is 6777778879. The next prime is 6777778919. The reversal of 6777778890 is 988777776.

It is a happy number.

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, 112962952 + ... + 112963011.

It is an arithmetic number, because the mean of its divisors is an integer number (1016666838).

Almost surely, 2^6777778890 is an apocalyptic number.

6777778890 is an abundant number, since it is smaller than the sum of its proper divisors (9488890518).

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

6777778890 is a wasteful number, since it uses less digits than its factorization.

6777778890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225925973.

The product of its (nonzero) digits is 58084992, while the sum is 66.

The square root of 6777778890 is about 82327.2669897404. The cubic root of 6777778890 is about 1892.4705604656.

The spelling of 6777778890 in words is "six billion, seven hundred seventy-seven million, seven hundred seventy-eight thousand, eight hundred ninety".