6665040 has 60 divisors (see below), whose sum is σ = 22385844. Its totient is φ = 1777152.

The previous prime is 6665017. The next prime is 6665047. The reversal of 6665040 is 405666.

It can be written as a sum of positive squares in 2 ways, for example, as 1245456 + 5419584 = 1116^2 + 2328^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a junction number, because it is equal to n+sod(n) for n = 6664995 and 6665013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665047) 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 11 ways as a sum of consecutive naturals, for example, 3909 + ... + 5348.

Almost surely, 2^6665040 is an apocalyptic number.

6665040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6665040 is an abundant number, since it is smaller than the sum of its proper divisors (15720804).

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

6665040 is a wasteful number, since it uses less digits than its factorization.

6665040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9276 (or 9267 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 6665040 is about 2581.6738756086. The cubic root of 6665040 is about 188.1918970116.

The spelling of 6665040 in words is "six million, six hundred sixty-five thousand, forty".