6781408 has 24 divisors (see below), whose sum is σ = 13538448. Its totient is φ = 3343104.

The previous prime is 6781399. The next prime is 6781409. The reversal of 6781408 is 8041876.

It is a happy number.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6781409) 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 3 ways as a sum of consecutive naturals, for example, 885 + ... + 3787.

It is an arithmetic number, because the mean of its divisors is an integer number (564102).

Almost surely, 2^6781408 is an apocalyptic number.

It is an amenable number.

6781408 is a deficient number, since it is larger than the sum of its proper divisors (6757040).

6781408 is a wasteful number, since it uses less digits than its factorization.

6781408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2986 (or 2978 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 6781408 is about 2604.1136687940. The cubic root of 6781408 is about 189.2808269840.

The spelling of 6781408 in words is "six million, seven hundred eighty-one thousand, four hundred eight".