6687840 has 48 divisors (see below), whose sum is σ = 21068208. Its totient is φ = 1783296.

The previous prime is 6687823. The next prime is 6687853. The reversal of 6687840 is 487866.

It is a tau number, because it is divible by the number of its divisors (48).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6487 + ... + 7446.

It is an arithmetic number, because the mean of its divisors is an integer number (438921).

Almost surely, 2^6687840 is an apocalyptic number.

6687840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6687840 is an abundant number, since it is smaller than the sum of its proper divisors (14380368).

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

6687840 is a wasteful number, since it uses less digits than its factorization.

6687840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13951 (or 13943 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 6687840 is about 2586.0858454429. The cubic root of 6687840 is about 188.4062439048.

The spelling of 6687840 in words is "six million, six hundred eighty-seven thousand, eight hundred forty".