6640467 has 4 divisors (see below), whose sum is σ = 8853960. Its totient is φ = 4426976.

The previous prime is 6640463. The next prime is 6640477. The reversal of 6640467 is 7640466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6640467 - 2² = 6640463 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (6640463) 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, 1106742 + ... + 1106747.

It is an arithmetic number, because the mean of its divisors is an integer number (2213490).

Almost surely, 2^6640467 is an apocalyptic number.

6640467 is a deficient number, since it is larger than the sum of its proper divisors (2213493).

6640467 is a wasteful number, since it uses less digits than its factorization.

6640467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2213492.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 6640467 is about 2576.9103593257. The cubic root of 6640467 is about 187.9603337923.

Subtracting 6640467 from its reverse (7640466), we obtain a palindrome (999999).

The spelling of 6640467 in words is "six million, six hundred forty thousand, four hundred sixty-seven".