6641720 has 16 divisors (see below), whose sum is σ = 14943960. Its totient is φ = 2656672.

The previous prime is 6641717. The next prime is 6641729. The reversal of 6641720 is 271466.

It is a super-2 number, since 2×6641720² = 88224889116800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6641720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6641729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82982 + ... + 83061.

Almost surely, 2^6641720 is an apocalyptic number.

It is an amenable number.

6641720 is an abundant number, since it is smaller than the sum of its proper divisors (8302240).

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

6641720 is a wasteful number, since it uses less digits than its factorization.

6641720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166054 (or 166050 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 6641720 is about 2577.1534684609. The cubic root of 6641720 is about 187.9721552242.

The spelling of 6641720 in words is "six million, six hundred forty-one thousand, seven hundred twenty".