6781788 has 72 divisors (see below), whose sum is σ = 18946928. Its totient is φ = 2032128.

The previous prime is 6781763. The next prime is 6781799. The reversal of 6781788 is 8871876.

6781788 is nontrivially palindromic in base 5.

6781788 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19956 + ... + 20292.

Almost surely, 2^6781788 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6781788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9473464).

6781788 is an abundant number, since it is smaller than the sum of its proper divisors (12165140).

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

6781788 is a wasteful number, since it uses less digits than its factorization.

6781788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403 (or 398 counting only the distinct ones).

The product of its digits is 150528, while the sum is 45.

The square root of 6781788 is about 2604.1866292568. The cubic root of 6781788 is about 189.2843624037.

It can be divided in two parts, 6781 and 788, that added together give a square (7569 = 87²).

The spelling of 6781788 in words is "six million, seven hundred eighty-one thousand, seven hundred eighty-eight".