6690440 has 16 divisors (see below), whose sum is σ = 15053580. Its totient is φ = 2676160.

The previous prime is 6690433. The next prime is 6690473. The reversal of 6690440 is 440966.

It can be written as a sum of positive squares in 2 ways, for example, as 6666724 + 23716 = 2582^2 + 154^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83591 + ... + 83670.

Almost surely, 2^6690440 is an apocalyptic number.

It is an amenable number.

6690440 is an abundant number, since it is smaller than the sum of its proper divisors (8363140).

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

6690440 is a wasteful number, since it uses less digits than its factorization.

6690440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167272 (or 167268 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 6690440 is about 2586.5884867910. The cubic root of 6690440 is about 188.4306560104.

The spelling of 6690440 in words is "six million, six hundred ninety thousand, four hundred forty".