6609640 has 32 divisors (see below), whose sum is σ = 14985000. Its totient is φ = 2623744.

The previous prime is 6609607. The next prime is 6609649. The reversal of 6609640 is 469066.

It can be written as a sum of positive squares in 4 ways, for example, as 1865956 + 4743684 = 1366^2 + 2178^2 .

It is not an unprimeable number, because it can be changed into a prime (6609649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5406 + ... + 6514.

Almost surely, 2^6609640 is an apocalyptic number.

It is an amenable number.

6609640 is an abundant number, since it is smaller than the sum of its proper divisors (8375360).

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

6609640 is a wasteful number, since it uses less digits than its factorization.

6609640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269 (or 1265 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 6609640 is about 2570.9220135975. The cubic root of 6609640 is about 187.6690268398.

The spelling of 6609640 in words is "six million, six hundred nine thousand, six hundred forty".