6687040 has 28 divisors (see below), whose sum is σ = 15924276. Its totient is φ = 2674688.

The previous prime is 6687017. The next prime is 6687049. The reversal of 6687040 is 407866.

6687040 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 3182656 + 3504384 = 1784^2 + 1872^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6686993 and 6687011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6687049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10129 + ... + 10768.

Almost surely, 2^6687040 is an apocalyptic number.

It is an amenable number.

6687040 is an abundant number, since it is smaller than the sum of its proper divisors (9237236).

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

6687040 is a wasteful number, since it uses less digits than its factorization.

6687040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20914 (or 20904 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 6687040 is about 2585.9311669107. The cubic root of 6687040 is about 188.3987312149.

The spelling of 6687040 in words is "six million, six hundred eighty-seven thousand, forty".