6664947 has 8 divisors (see below), whose sum is σ = 8926656. Its totient is φ = 4423272.

The previous prime is 6664939. The next prime is 6664951. The reversal of 6664947 is 7494666.

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

It is not a de Polignac number, because 6664947 - 2³ = 6664939 is a prime.

6664947 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6664899 and 6664908.

It is not an unprimeable number, because it can be changed into a prime (6664937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4213 + ... + 5574.

It is an arithmetic number, because the mean of its divisors is an integer number (1115832).

Almost surely, 2^6664947 is an apocalyptic number.

6664947 is a deficient number, since it is larger than the sum of its proper divisors (2261709).

6664947 is a wasteful number, since it uses less digits than its factorization.

6664947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10017.

The product of its digits is 217728, while the sum is 42.

The square root of 6664947 is about 2581.6558639757. The cubic root of 6664947 is about 188.1910217017.

The spelling of 6664947 in words is "six million, six hundred sixty-four thousand, nine hundred forty-seven".