6440222420 has 24 divisors (see below), whose sum is σ = 13542799200. Its totient is φ = 2572597152.

The previous prime is 6440222419. The next prime is 6440222431. The reversal of 6440222420 is 242220446.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 6440222420.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203090 + ... + 232649.

It is an arithmetic number, because the mean of its divisors is an integer number (564283300).

Almost surely, 2^6440222420 is an apocalyptic number.

It is an amenable number.

6440222420 is an abundant number, since it is smaller than the sum of its proper divisors (7102576780).

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

6440222420 is a wasteful number, since it uses less digits than its factorization.

6440222420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436487 (or 436485 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

The square root of 6440222420 is about 80250.9963801073. The cubic root of 6440222420 is about 1860.5169122534.

Adding to 6440222420 its reverse (242220446), we get a palindrome (6682442866).

The spelling of 6440222420 in words is "six billion, four hundred forty million, two hundred twenty-two thousand, four hundred twenty".