6605978 has 8 divisors (see below), whose sum is σ = 9943668. Its totient is φ = 3291424.

The previous prime is 6605971. The next prime is 6605983. The reversal of 6605978 is 8795066.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6466849 + 139129 = 2543^2 + 373^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (6605971) 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, 5051 + ... + 6222.

Almost surely, 2^6605978 is an apocalyptic number.

6605978 is a deficient number, since it is larger than the sum of its proper divisors (3337690).

6605978 is a wasteful number, since it uses less digits than its factorization.

6605978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11568.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 6605978 is about 2570.2097190696. The cubic root of 6605978 is about 187.6343617680.

The spelling of 6605978 in words is "six million, six hundred five thousand, nine hundred seventy-eight".