6664860 has 72 divisors (see below), whose sum is σ = 20582016. Its totient is φ = 1745280.

The previous prime is 6664859. The next prime is 6664873. The reversal of 6664860 is 684666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10677 + ... + 11283.

Almost surely, 2^6664860 is an apocalyptic number.

6664860 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6664860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10291008).

6664860 is an abundant number, since it is smaller than the sum of its proper divisors (13917156).

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

6664860 is a wasteful number, since it uses less digits than its factorization.

6664860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683 (or 678 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 6664860 is about 2581.6390142698. The cubic root of 6664860 is about 188.1902028559.

The spelling of 6664860 in words is "six million, six hundred sixty-four thousand, eight hundred sixty".