6663940 has 12 divisors (see below), whose sum is σ = 13994316. Its totient is φ = 2665568.

The previous prime is 6663911. The next prime is 6663941. The reversal of 6663940 is 493666.

It can be written as a sum of positive squares in 2 ways, for example, as 4726276 + 1937664 = 2174^2 + 1392^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6663896 and 6663905.

It is not an unprimeable number, because it can be changed into a prime (6663941) 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 3 ways as a sum of consecutive naturals, for example, 166579 + ... + 166618.

It is an arithmetic number, because the mean of its divisors is an integer number (1166193).

Almost surely, 2^6663940 is an apocalyptic number.

It is an amenable number.

6663940 is an abundant number, since it is smaller than the sum of its proper divisors (7330376).

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

6663940 is a wasteful number, since it uses less digits than its factorization.

6663940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333206 (or 333204 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 6663940 is about 2581.4608267413. The cubic root of 6663940 is about 188.1815433615.

The spelling of 6663940 in words is "six million, six hundred sixty-three thousand, nine hundred forty".