6791778 has 48 divisors (see below), whose sum is σ = 17709120. Its totient is φ = 1837728.

The previous prime is 6791777. The next prime is 6791779. The reversal of 6791778 is 8771976.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6791777) and next prime (6791779).

It is a super-2 number, since 2×6791778² = 92256496802568, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (6791777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 976 + ... + 3812.

It is an arithmetic number, because the mean of its divisors is an integer number (368940).

Almost surely, 2^6791778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6791778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8854560).

6791778 is an abundant number, since it is smaller than the sum of its proper divisors (10917342).

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

6791778 is a wasteful number, since it uses less digits than its factorization.

6791778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2871 (or 2868 counting only the distinct ones).

The product of its digits is 148176, while the sum is 45.

The square root of 6791778 is about 2606.1039887157. The cubic root of 6791778 is about 189.3772593921.

It can be divided in two parts, 6791 and 778, that added together give a square (7569 = 87²).

The spelling of 6791778 in words is "six million, seven hundred ninety-one thousand, seven hundred seventy-eight".