6660387 has 12 divisors (see below), whose sum is σ = 9977240. Its totient is φ = 4440096.

The previous prime is 6660377. The next prime is 6660389. The reversal of 6660387 is 7830666.

It is a happy number.

It is not a de Polignac number, because 6660387 - 2⁴ = 6660371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6660389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13462 + ... + 13947.

Almost surely, 2^6660387 is an apocalyptic number.

6660387 is a deficient number, since it is larger than the sum of its proper divisors (3316853).

6660387 is an equidigital number, since it uses as much as digits as its factorization.

6660387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27424 (or 27412 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 6660387 is about 2580.7725587506. The cubic root of 6660387 is about 188.1480932862.

The spelling of 6660387 in words is "six million, six hundred sixty thousand, three hundred eighty-seven".