6776781020 has 24 divisors (see below), whose sum is σ = 14431683168. Its totient is φ = 2672532800.

The previous prime is 6776781013. The next prime is 6776781049. The reversal of 6776781020 is 201876776.

It is a congruent number.

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, 2384771 + ... + 2387610.

It is an arithmetic number, because the mean of its divisors is an integer number (601320132).

Almost surely, 2^6776781020 is an apocalyptic number.

It is an amenable number.

6776781020 is an abundant number, since it is smaller than the sum of its proper divisors (7654902148).

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

6776781020 is a wasteful number, since it uses less digits than its factorization.

6776781020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4772461 (or 4772459 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 44.

The square root of 6776781020 is about 82321.2063808591. The cubic root of 6776781020 is about 1892.3776818440.

The spelling of 6776781020 in words is "six billion, seven hundred seventy-six million, seven hundred eighty-one thousand, twenty".