6840664 has 32 divisors (see below), whose sum is σ = 13705200. Its totient is φ = 3189760.

The previous prime is 6840661. The next prime is 6840721. The reversal of 6840664 is 4660486.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6840661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24204 + ... + 24484.

Almost surely, 2^6840664 is an apocalyptic number.

It is an amenable number.

6840664 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

6840664 is a wasteful number, since it uses less digits than its factorization.

6840664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483 (or 479 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 6840664 is about 2615.4663064165. The cubic root of 6840664 is about 189.8305414278.

The spelling of 6840664 in words is "six million, eight hundred forty thousand, six hundred sixty-four".