6643402 has 8 divisors (see below), whose sum is σ = 10001412. Its totient is φ = 3309600.

The previous prime is 6643381. The next prime is 6643411. The reversal of 6643402 is 2043466.

It can be written as a sum of positive squares in 2 ways, for example, as 6558721 + 84681 = 2561^2 + 291^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5349 + ... + 6472.

Almost surely, 2^6643402 is an apocalyptic number.

6643402 is a deficient number, since it is larger than the sum of its proper divisors (3358010).

6643402 is a wasteful number, since it uses less digits than its factorization.

6643402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12104.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 6643402 is about 2577.4797768363. The cubic root of 6643402 is about 187.9880217206.

Adding to 6643402 its reverse (2043466), we get a palindrome (8686868).

The spelling of 6643402 in words is "six million, six hundred forty-three thousand, four hundred two".