6640968 has 16 divisors (see below), whose sum is σ = 16602480. Its totient is φ = 2213648.

The previous prime is 6640967. The next prime is 6640979. The reversal of 6640968 is 8690466.

It is not an unprimeable number, because it can be changed into a prime (6640967) 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, 138330 + ... + 138377.

It is an arithmetic number, because the mean of its divisors is an integer number (1037655).

Almost surely, 2^6640968 is an apocalyptic number.

It is an amenable number.

6640968 is an abundant number, since it is smaller than the sum of its proper divisors (9961512).

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

6640968 is a wasteful number, since it uses less digits than its factorization.

6640968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276716 (or 276712 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 6640968 is about 2577.0075669272. The cubic root of 6640968 is about 187.9650606565.

Subtracting from 6640968 its sum of digits (39), we obtain a square (6640929 = 2577²).

The spelling of 6640968 in words is "six million, six hundred forty thousand, nine hundred sixty-eight".