6778720 has 48 divisors (see below), whose sum is σ = 17251920. Its totient is φ = 2502144.

The previous prime is 6778703. The next prime is 6778727. The reversal of 6778720 is 278776.

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 6778720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6778727) 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 7 ways as a sum of consecutive naturals, for example, 451 + ... + 3709.

It is an arithmetic number, because the mean of its divisors is an integer number (359415).

Almost surely, 2^6778720 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 6778720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8625960).

6778720 is an abundant number, since it is smaller than the sum of its proper divisors (10473200).

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

6778720 is a wasteful number, since it uses less digits than its factorization.

6778720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3287 (or 3279 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 37.

The square root of 6778720 is about 2603.5975111372. The cubic root of 6778720 is about 189.2558147691.

It can be divided in two parts, 67 and 78720, that added together give a palindrome (78787).

The spelling of 6778720 in words is "six million, seven hundred seventy-eight thousand, seven hundred twenty".