6781240 has 16 divisors (see below), whose sum is σ = 15257880. Its totient is φ = 2712480.

The previous prime is 6781231. The next prime is 6781253. The reversal of 6781240 is 421876.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6781199 and 6781208.

It is a congruent number.

It is an unprimeable number.

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, 84726 + ... + 84805.

Almost surely, 2^6781240 is an apocalyptic number.

It is an amenable number.

6781240 is an abundant number, since it is smaller than the sum of its proper divisors (8476640).

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

6781240 is a wasteful number, since it uses less digits than its factorization.

6781240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169542 (or 169538 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 6781240 is about 2604.0814119378. The cubic root of 6781240 is about 189.2792639142.

It can be divided in two parts, 6781 and 240, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 6781240 in words is "six million, seven hundred eighty-one thousand, two hundred forty".