6671664 has 60 divisors (see below), whose sum is σ = 18889416. Its totient is φ = 2198016.

The previous prime is 6671663. The next prime is 6671669. The reversal of 6671664 is 4661766.

It is a super-2 number, since 2×6671664² = 89022201057792, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (6671663) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 15192 + ... + 15624.

Almost surely, 2^6671664 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 6671664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9444708).

6671664 is an abundant number, since it is smaller than the sum of its proper divisors (12217752).

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

6671664 is a wasteful number, since it uses less digits than its factorization.

6671664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554 (or 545 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 6671664 is about 2582.9564456258. The cubic root of 6671664 is about 188.2542207378.

The spelling of 6671664 in words is "six million, six hundred seventy-one thousand, six hundred sixty-four".