6721008 has 80 divisors (see below), whose sum is σ = 20165376. Its totient is φ = 1889280.

The previous prime is 6720947. The next prime is 6721009. The reversal of 6721008 is 8001276.

6721008 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

6721008 is a modest number, since divided by 1008 gives 672 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27768 + ... + 28008.

Almost surely, 2^6721008 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 6721008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10082688).

6721008 is an abundant number, since it is smaller than the sum of its proper divisors (13444368).

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

6721008 is a wasteful number, since it uses less digits than its factorization.

6721008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 6721008 is about 2592.4906942938. The cubic root of 6721008 is about 188.7171941289.

The spelling of 6721008 in words is "six million, seven hundred twenty-one thousand, eight".