6721330 has 96 divisors (see below), whose sum is σ = 16251840. Its totient is φ = 1975680.

The previous prime is 6721303. The next prime is 6721331. The reversal of 6721330 is 331276.

6721330 is digitally balanced in base 8, 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 (22).

6721330 is strictly pandigital in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721331) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 156289 + ... + 156331.

It is an arithmetic number, because the mean of its divisors is an integer number (169290).

Almost surely, 2^6721330 is an apocalyptic number.

6721330 is an abundant number, since it is smaller than the sum of its proper divisors (9530510).

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

6721330 is a wasteful number, since it uses less digits than its factorization.

6721330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 6721330 is about 2592.5527959909. The cubic root of 6721330 is about 188.7202078617.

It can be divided in two parts, 672 and 1330, that added together give a palindrome (2002).

The spelling of 6721330 in words is "six million, seven hundred twenty-one thousand, three hundred thirty".