6643435 has 16 divisors (see below), whose sum is σ = 8527680. Its totient is φ = 4956160.

The previous prime is 6643423. The next prime is 6643453. The reversal of 6643435 is 5343466.

6643435 = T₁₁₆ + T₁₁₇ + ... + T₃₄₅.

It is not a de Polignac number, because 6643435 - 2¹¹ = 6641387 is a prime.

6643435 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6643397 and 6643406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4011 + ... + 5419.

It is an arithmetic number, because the mean of its divisors is an integer number (532980).

Almost surely, 2^6643435 is an apocalyptic number.

6643435 is a deficient number, since it is larger than the sum of its proper divisors (1884245).

6643435 is a wasteful number, since it uses less digits than its factorization.

6643435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1478.

The product of its digits is 25920, while the sum is 31.

The square root of 6643435 is about 2577.4861784304. The cubic root of 6643435 is about 187.9883329866.

Adding to 6643435 its sum of digits (31), we get a palindrome (6643466).

The spelling of 6643435 in words is "six million, six hundred forty-three thousand, four hundred thirty-five".