6640336 has 20 divisors (see below), whose sum is σ = 13623012. Its totient is φ = 3124736.

The previous prime is 6640331. The next prime is 6640339. The reversal of 6640336 is 6330466.

It can be written as a sum of positive squares in 2 ways, for example, as 3240000 + 3400336 = 1800^2 + 1844^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640331) 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, 11935 + ... + 12478.

Almost surely, 2^6640336 is an apocalyptic number.

It is an amenable number.

6640336 is an abundant number, since it is smaller than the sum of its proper divisors (6982676).

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

6640336 is a wasteful number, since it uses less digits than its factorization.

6640336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24438 (or 24432 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 6640336 is about 2576.8849411644. The cubic root of 6640336 is about 187.9590977865.

The spelling of 6640336 in words is "six million, six hundred forty thousand, three hundred thirty-six".