6420640606 has 8 divisors (see below), whose sum is σ = 9634437360. Its totient is φ = 3209161488.

The previous prime is 6420640573. The next prime is 6420640643. The reversal of 6420640606 is 6060460246.

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

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, 572466 + ... + 583573.

It is an arithmetic number, because the mean of its divisors is an integer number (1204304670).

Almost surely, 2^6420640606 is an apocalyptic number.

6420640606 is a deficient number, since it is larger than the sum of its proper divisors (3213796754).

6420640606 is a wasteful number, since it uses less digits than its factorization.

6420640606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158818.

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 6420640606 is about 80128.8999425301. The cubic root of 6420640606 is about 1858.6293333794.

It can be divided in two parts, 6420640 and 606, that added together give a palindrome (6421246).

The spelling of 6420640606 in words is "six billion, four hundred twenty million, six hundred forty thousand, six hundred six".