6667840 has 56 divisors (see below), whose sum is σ = 16166592. Its totient is φ = 2618880.

The previous prime is 6667819. The next prime is 6667853. The reversal of 6667840 is 487666.

It is a self number, because there is not a number n which added to its sum of digits gives 6667840.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 21285 + ... + 21595.

Almost surely, 2^6667840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6667840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8083296).

6667840 is an abundant number, since it is smaller than the sum of its proper divisors (9498752).

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

6667840 is a wasteful number, since it uses less digits than its factorization.

6667840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 6667840 is about 2582.2161024980. The cubic root of 6667840 is about 188.2182466179.

The spelling of 6667840 in words is "six million, six hundred sixty-seven thousand, eight hundred forty".