6396435220 has 72 divisors (see below), whose sum is σ = 15862960512. Its totient is φ = 2122274880.

The previous prime is 6396435209. The next prime is 6396435259. The reversal of 6396435220 is 225346936.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110769 + ... + 158311.

It is an arithmetic number, because the mean of its divisors is an integer number (220318896).

Almost surely, 2^6396435220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6396435220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7931480256).

6396435220 is an abundant number, since it is smaller than the sum of its proper divisors (9466525292).

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

6396435220 is a wasteful number, since it uses less digits than its factorization.

6396435220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47621 (or 47588 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 40.

The square root of 6396435220 is about 79977.7170216805. The cubic root of 6396435220 is about 1856.2907560272.

The spelling of 6396435220 in words is "six billion, three hundred ninety-six million, four hundred thirty-five thousand, two hundred twenty".