6667720 has 16 divisors (see below), whose sum is σ = 15002460. Its totient is φ = 2667072.

The previous prime is 6667711. The next prime is 6667721. The reversal of 6667720 is 277666.

It can be written as a sum of positive squares in 2 ways, for example, as 6240004 + 427716 = 2498^2 + 654^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6667721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83307 + ... + 83386.

Almost surely, 2^6667720 is an apocalyptic number.

It is an amenable number.

6667720 is an abundant number, since it is smaller than the sum of its proper divisors (8334740).

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

6667720 is a wasteful number, since it uses less digits than its factorization.

6667720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166704 (or 166700 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 6667720 is about 2582.1928665381. The cubic root of 6667720 is about 188.2171175004.

The spelling of 6667720 in words is "six million, six hundred sixty-seven thousand, seven hundred twenty".