6640422 has 16 divisors (see below), whose sum is σ = 13858560. Its totient is φ = 2117192.

The previous prime is 6640411. The next prime is 6640429. The reversal of 6640422 is 2240466.

It is a junction number, because it is equal to n+sod(n) for n = 6640392 and 6640401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640429) 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 7 ways as a sum of consecutive naturals, for example, 23922 + ... + 24197.

It is an arithmetic number, because the mean of its divisors is an integer number (866160).

Almost surely, 2^6640422 is an apocalyptic number.

6640422 is an abundant number, since it is smaller than the sum of its proper divisors (7218138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6640422 is a wasteful number, since it uses less digits than its factorization.

6640422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48147.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 6640422 is about 2576.9016279245. The cubic root of 6640422 is about 187.9599092120.

Adding to 6640422 its reverse (2240466), we get a palindrome (8880888).

The spelling of 6640422 in words is "six million, six hundred forty thousand, four hundred twenty-two".