6721722 has 36 divisors (see below), whose sum is σ = 16943706. Its totient is φ = 1920240.

The previous prime is 6721711. The next prime is 6721723. The reversal of 6721722 is 2271276.

It can be written as a sum of positive squares in only one way, i.e., 4498641 + 2223081 = 2121^2 + 1491^2 .

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6721723) 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 17 ways as a sum of consecutive naturals, for example, 2929 + ... + 4692.

Almost surely, 2^6721722 is an apocalyptic number.

6721722 is an abundant number, since it is smaller than the sum of its proper divisors (10221984).

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

6721722 is a wasteful number, since it uses less digits than its factorization.

6721722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7643 (or 7633 counting only the distinct ones).

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

The square root of 6721722 is about 2592.6283960491. The cubic root of 6721722 is about 188.7238766238.

Adding to 6721722 its reverse (2271276), we get a palindrome (8992998).

The spelling of 6721722 in words is "six million, seven hundred twenty-one thousand, seven hundred twenty-two".