6640430 has 8 divisors (see below), whose sum is σ = 11952792. Its totient is φ = 2656168.

The previous prime is 6640429. The next prime is 6640441. The reversal of 6640430 is 340466.

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

It is a junction number, because it is equal to n+sod(n) for n = 6640396 and 6640405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332012 + ... + 332031.

It is an arithmetic number, because the mean of its divisors is an integer number (1494099).

Almost surely, 2^6640430 is an apocalyptic number.

6640430 is a deficient number, since it is larger than the sum of its proper divisors (5312362).

6640430 is a wasteful number, since it uses less digits than its factorization.

6640430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664050.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 6640430 is about 2576.9031801758. The cubic root of 6640430 is about 187.9599846930.

Adding to 6640430 its reverse (340466), we get a palindrome (6980896).

The spelling of 6640430 in words is "six million, six hundred forty thousand, four hundred thirty".