6721740 has 72 divisors (see below), whose sum is σ = 20638800. Its totient is φ = 1770624.

The previous prime is 6721739. The next prime is 6721747. The reversal of 6721740 is 471276.

It is not an unprimeable number, because it can be changed into a prime (6721747) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19086 + ... + 19434.

It is an arithmetic number, because the mean of its divisors is an integer number (286650).

Almost surely, 2^6721740 is an apocalyptic number.

6721740 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 6721740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10319400).

6721740 is an abundant number, since it is smaller than the sum of its proper divisors (13917060).

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

6721740 is a wasteful number, since it uses less digits than its factorization.

6721740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471 (or 466 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 6721740 is about 2592.6318674274. The cubic root of 6721740 is about 188.7240450840.

The spelling of 6721740 in words is "six million, seven hundred twenty-one thousand, seven hundred forty".