6640970 has 24 divisors (see below), whose sum is σ = 13906404. Its totient is φ = 2276736.

The previous prime is 6640967. The next prime is 6640979. The reversal of 6640970 is 790466.

It can be written as a sum of positive squares in 2 ways, for example, as 6599761 + 41209 = 2569^2 + 203^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6640979) 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, 6287 + ... + 7266.

Almost surely, 2^6640970 is an apocalyptic number.

6640970 is an abundant number, since it is smaller than the sum of its proper divisors (7265434).

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

6640970 is a wasteful number, since it uses less digits than its factorization.

6640970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13574 (or 13567 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 6640970 is about 2577.0079549741. The cubic root of 6640970 is about 187.9650795258.

The spelling of 6640970 in words is "six million, six hundred forty thousand, nine hundred seventy".